Fire detection apparatus

ABSTRACT

A fire detection apparatus 1A includes a heat detection unit 110A provided such that a part of the heat detection unit 110A is accommodated in an outer cover 20A and another part of the heat detection unit 110A is exposed to an outside of the fire detection apparatus 1A through an insertion hole 120A formed in a top surface portion 22A, and a guard portion 130A which is provided to cover a periphery of the insertion hole 120A and another part of the heat detection unit 110A in the top surface portion 22A and has a plurality of ribs, in which a material of a rib corresponding to a first guard side rib 131A among the plurality of ribs is made different from a material of some other ribs, or a shape of the first guard side rib 131A among the plurality of ribs is made different from a shape of some other ribs.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of Patent Application inJapan No. 2018-062681 filed on Mar. 28, 2018, Patent Application inJapan No. 2018-162772 filed on Aug. 31, 2018, Patent Application inJapan No. 2018-173389 filed on Sep. 18, 2018 and the benefit of PCTapplication No. PCT/JP2019/012780 filed on Mar. 26, 2019, the disclosureof which is incorporated by reference its entirety.

INCORPORATION BY REFERENCE

All publications and patent applications mentioned in this specificationare herein incorporated by reference in their entirety to the sameextent as if each individual publication or patent application wasspecifically and individually indicated to be incorporated by reference.

TECHNICAL FIELD

The present invention relates to a fire detection apparatus.

BACKGROUND ART

Conventionally, a fire detector for detecting a fire in a monitored areahas been known (for example, see Patent Document 1 to Patent Document3).

Specifically, with regard to a fire detector of Patent Document 1, atechnology for protecting a temperature detection element has beenproposed. In this technology, a heat detector is configured to includethe temperature detection element, a detector body for accommodating thetemperature detection element, an insertion hole provided in a lowersurface of the detector body to expose only a part of the temperaturedetection element to the outside of the detector body, and a protectorwhich is provided on the lower surface of the detector body, has aplurality of ribs formed in the same shape, and is used to cover thetemperature detection element exposed to the outside. In addition, adisplay hole for visually recognizing an indicator light accommodated inthe detector body from the outside is provided in a portion other than aportion of the lower surface of the detector body corresponding to theprotector (for example, see Patent Document 1).

In addition, with regard to a fire detector of Patent Document 2, atechnology capable of detecting heat and carbon monoxide has beenproposed. In this technology, a detector is configured to include acarbon monoxide detection unit accommodated in a housing to detectcarbon monoxide in a detection space located inside the housing(hereinafter referred to as a “first detection space”), and a heatdetection unit accommodated in the housing to detect heat in a detectionspace located outside the housing (hereinafter referred to as a “seconddetection space”). In addition, the housing is provided with an inletfor allowing gas containing carbon monoxide to flow into the firstdetection space, and an insertion hole for inserting a part of the heatdetection unit into the second detection space (for example, see PatentDocument 2).

In addition, with regard to a fire detector of Patent Document 3, atechnology capable of detecting heat and smoke has been proposed. Inthis technology, a detector is configured to include a base for storinga substrate on which a smoke detection element and a heat detectionelement are disposed, a structure coupled to the base, and a structurecap coupled to the structure. In addition, this detector is providedwith a space which is surrounded by the base, the structure, and thestructure cap and in which smoke is detected by the smoke detectionelement inserted into the space (hereinafter referred to as a “firstdetection space”), a space which is located on the outer side of thefirst detection space, is surrounded by the base and the structure cap,and allows gas containing smoke to flow into the first detection space(hereinafter referred to as an “inflow space”), and a space which islocated inside the inflow space and in which heat is detected by theheat detection element inserted into the space (hereinafter referred toas a “second detection space”) (for example, see Patent Document 3).

CITATION LIST Patent Document

Patent Document 1: Laid-open Patent Application Publication in Japan No.2012-198757

Patent Document 2: Laid-open Patent Application Publication in Japan No0.2014-199632

Patent Document 3: Laid-open Patent Application Publication in Japan No.Heisei 9-16869

SUMMARY OF THE INVENTION Technical Problem

However, in the fire detectors of Patent Document 1 to Patent Document3, first to third problems shown below occur.

First, with regard to the first problem, in the fire detector of PatentDocument 1, since the protector and the display hole are provided to beexposed to the outside on the lower surface of the detector body, boththe protector and the display hole are conspicuous from the outside, andthus there is concern that a design property of the heat detector may bedegraded. In addition, since the shapes of the plurality of ribs of theprotector are the same, for example, it is difficult to make an inflowof an air flow flowing into the protector from each direction uniform inaccordance with an installation state of the heat detector, and thusthere is a possibility that it may be difficult to improve an inflowproperty of the air flow. Therefore, there is room for improvement froma viewpoint of the design property or the inflow property of the airflow.

In addition, with regard to the second problem, in the fire detector ofPatent Document 2, as described above, since the inlet and the insertionhole are provided in the housing, for example, gas flowing into thefirst detection space through the inlet (specifically, gas containing afirst detection target such as carbon monoxide) flows out to the seconddetection space through the insertion hole. Thus, it is difficult toaccurately detect the second detection target such as heat due to thegas that has flowed out. Therefore, there is room for improvement from aviewpoint of maintaining detection accuracy of the second detectiontarget.

In addition, with regard to the third problem, in the fire detector ofPatent Document 3, as described above, since the second detection spaceis located inside the inflow space, gas containing a first detectiontarget such as smoke is likely to flow into the second detection space.Thus, it is difficult to accurately detect a second detection targetsuch as heat due to the gas that has flowed in. Therefore, there is roomfor improvement from a viewpoint of maintaining or improving detectionaccuracy of the second detection target.

It is an object of the present invention to solve the problems of theabove mentioned prior arts.

One aspect of the present invention provides a fire detection apparatuscomprises a housing; and a unit that detects the fire on an inside ofthe housing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view illustrating an attachment state of a firedetection apparatus according to Embodiment 1.

FIG. 2 is an enlarged view of an area of the fire detection apparatus ofFIG. 1.

FIG. 3 is a bottom view illustrating the fire detection apparatus in astate of removing an attachment base.

FIG. 4 is a cross-sectional view taken along A-A line of FIG. 3.

FIG. 5 is a side view illustrating an attachment state of a firedetection apparatus according to Embodiment 2.

FIG. 6 is a diagram illustrating the fire detection apparatus in a stateof removing an attachment base, in which FIG. 6(a) is a plan view andFIG. 6(b) is a bottom view.

FIG. 7 is a cross-sectional view taken along A-A line of FIG. 6(b).

FIG. 8 is a diagram illustrating an inner cover, in which FIG. 8(a) is aplan view and FIG. 8(b) is a bottom view.

FIG. 9 is a side view illustrating an attachment state of a firedetection apparatus according to Embodiment 3.

FIG. 10 is a diagram illustrating the fire detection apparatus in astate of removing an attachment base, in which FIG. 10(a) is a plan viewand FIG. 10(b) is a bottom view.

FIG. 11 is a cross-sectional view taken along A-A line of FIG. 10(b).

FIG. 12 is a cross-sectional view taken along B-B line of FIG. 10(b).

FIG. 13 is a perspective view illustrating an inner cover.

FIG. 14 is a perspective view illustrating a detector cover.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a fire detection apparatus according to theinvention will be described in detail with reference to drawings. First,[I] basic concepts of the embodiments will be described, and then [II]specific contents of the embodiments will be described. Finally, [III]modifications to the embodiments will be described. However, theinvention is not limited by the embodiments.

[I] BASIC CONCEPTS OF EMBODIMENTS

First, the basic concepts of Embodiment 1 to Embodiment 3 will bedescribed.

Basic Concept of Embodiment 1

First, the basic concept of Embodiment 1 will be described. Embodiment 1(mode corresponding to Problem 1) is generally a fire detectionapparatus attached to an installation surface of an installation object,and relates to a fire detection apparatus for detecting a fire in amonitored area.

Here, in Embodiment 1, the “fire detection apparatus” is an apparatusthat thermally detects and reports a fire in the monitored area, and isa concept including, for example, a thermal fire detector or fire alarm,a thermal and optical fire detector or fire alarm, etc. In addition, the“installation object” is an object on which the fire detection apparatusis installed, and is a concept including, for example, a ceiling portionor a wall portion of a building. In addition, a specific structure ortype of the “building” is arbitrary. For example, the “building” is aconcept including, for example, a detached house, a complex buildingsuch as a row house or an apartment, an office building, an eventfacility, a commercial facility, a public facility, etc. In addition,the “monitored area” is an area to be monitored and is a conceptincluding, for example, an area inside the building, an area outside thebuilding, etc. In addition, “reporting” is a concept including, forexample, outputting predetermined information to an external apparatus,displaying predetermined information or outputting the predeterminedinformation as a sound via an output unit (a display unit or a soundoutput unit), etc. Hereinafter, in Embodiment 1, a description will begiven of a case where the “fire detection apparatus” corresponds to the“thermal and optical fire detector”, the “installation object”corresponds to the “ceiling portion of the office building”, and the“monitored area” corresponds to the “area inside the office building”.

Basic Concept of Embodiment 2

Next, the basic concept of Embodiment 2 will be described. Embodiment 2(mode corresponding to Problem 2) generally relates to a fire detectionapparatus for detecting a fire in the monitored area.

Here, in Embodiment 2, the “fire detection apparatus” is an apparatusthat detects and reports a fire in the monitored area on the basis ofdetection results of a plurality of detection targets, and is a conceptincluding, for example, a thermal and electrical fire detector or firealarm, a thermal and optical fire detector or fire alarm, a thermal,electrical, and optical fire detector or fire alarm, etc. In addition,the “monitored area” is an area to be monitored and is a conceptincluding, for example, an area inside the building, an area outside thebuilding, etc. In addition, a specific structure or type of the“building” is arbitrary. For example, the “building” is a conceptincluding a detached house, a complex building such as a row house or anapartment, an office building, an event facility, a commercial facility,a public facility, etc. In addition, “reporting” is a concept including,for example, outputting predetermined information to an externalapparatus, displaying predetermined information or outputting thepredetermined information as a sound via an output unit (a display unitor a sound output unit), etc. Hereinafter, in Embodiment 2, adescription will be given of a case where the “fire detection apparatus”corresponds to the “thermal, electrical, and optical fire detector”, andthe “monitored area” corresponds to the “area inside the officebuilding”.

Basic Concept of Embodiment 3

Next, the basic concept of Embodiment 3 will be described. Embodiment 3(mode corresponding to Problem 3) generally relates to a fire detectionapparatus for detecting a fire in the monitored area.

Here, in Embodiment 3, the “fire detection apparatus” is an apparatusthat detects and reports a fire in the monitored area on the basis ofdetection results of a plurality of detection targets, and is a conceptincluding, for example, a thermal and electrical fire detector or firealarm, a thermal and optical fire detector or fire alarm, a thermal,electrical, and optical fire detector or fire alarm, etc. In addition,the “monitored area” is an area to be monitored and is a conceptincluding, for example, an area inside the building, an area outside thebuilding, etc. In addition, a specific structure or type of the“building” is arbitrary. For example, the “building” is a conceptincluding a detached house, a complex building such as a row house or anapartment, an office building, an event facility, a commercial facility,a public facility, etc. In addition, “reporting” is a concept including,for example, outputting predetermined information to an externalapparatus, displaying predetermined information or outputting thepredetermined information as a sound via an output unit (a display unitor a sound output unit), etc. Hereinafter, in Embodiment 3, adescription will be given of a case where the “fire detection apparatus”corresponds to the “thermal and optical fire detector”, and the“monitored area” corresponds to the “area inside the office building”.

[II] SPECIFIC CONTENTS OF EMBODIMENTS

Next, specific contents of the embodiments will be described.

Embodiment 1

First, the fire detection apparatus according to Embodiment 1 will bedescribed. Embodiment 1 corresponds to a mode in which a material ofsome of a plurality of ribs described below is made different from amaterial of some other ribs.

(Configuration)

First, a description will be given of a configuration of the firedetection apparatus according to Embodiment 1. FIG. 1 is a side viewillustrating an attachment state of the fire detection apparatusaccording to Embodiment 1. FIG. 2 is an enlarged view of an area of thefire detection apparatus of FIG. 1. FIG. 3 is a bottom view illustratingthe fire detection apparatus in a state of removing an attachment basedescribed below. FIG. 4 is a cross-sectional view taken along A-A lineof FIG. 3. In the following description, an X direction of FIG. 1 isreferred to as a left-right direction of the fire detection apparatus (a+X direction is a left direction of the fire detection apparatus and a−X direction is a right direction of the fire detection apparatus), a Ydirection of FIG. 3 is referred to as a front-back direction of the firedetection apparatus (a +Y direction is a frontward direction of the firedetection apparatus and a −Y direction is a backward direction of thefire detection apparatus), and a Z direction of FIG. 1 is referred to asa vertical direction of the fire detection apparatus (a +Z direction isan upward direction of the fire detection apparatus and a −Z directionis a downward direction of the fire detection apparatus). In addition,with reference to a center position of the detection space of FIG. 3, adirection away from the detection space is referred to as an “outerside”, and a direction approaching the detection space is referred to asan “inner side”.

The fire detection apparatus 1A is an apparatus that detects heat in themonitored area, and detects and reports a substance to be detected (forexample, smoke, etc.) contained in gas. The fire detection apparatus 1Ais installed on an installation surface 2A on a lower surface of aceiling portion (installation object) of a building in an interior ofthe building, and includes an attachment base 10A, an outer cover 20A,an inner cover 30A, an inflow space 40A, an insect screen 50A, adetection space 60A, a detector cover 70A, a detector body 80A, aterminal board 90A, and a substrate 100A as illustrated in FIG. 1 toFIG. 4.

(Configuration—Attachment Base)

Returning to FIG. 1, the attachment base 10A is an attaching unit thatattaches the outer cover 20A to the installation surface 2A. Theattachment base 10A is configured using, for example, a known attachmentbase for the fire detection apparatus (as an example, a substantiallyplate-shaped attachment base made of resin), etc., and is fixed to theinstallation surface 2A by a fixing tool, etc. as illustrated in FIG. 2and FIG. 3.

(Configuration—Outer Cover)

Returning to FIG. 2, the outer cover 20A is a cover that covers theinner cover 30A, the inflow space 40A, the insect screen 50A, thedetection space 60A, the detector cover 70A, the detector body 80A, theterminal board 90A, and the substrate 100A. The outer cover 20A isformed of, for example, a resin material having a light shieldingproperty, and includes an outer cover body 21A, a top surface portion22A, a first rib portion 23A, and a second rib portion 24A asillustrated in FIG. 2 to FIG. 4.

Among these portions, the outer cover body 21A is a basic structure ofthe outer cover 20A. The outer cover body 21A is formed of, for example,a substantially hollow cylindrical body whose upper surface and lowersurface are open, is disposed so that an upper end portion of the outercover body 21A comes into contact with a lower surface of the attachmentbase 10A as illustrated in FIG. 2, and is fixed to the attachment base10A by a fitting structure (or a fixing tool), etc.

In addition, the top surface portion 22A is a partition unit thatpartitions the inflow space 40A. The top surface portion 22A is formedof, for example, a substantially circular plate-shaped body, and isprovided substantially horizontally below the outer cover body 21A asillustrated in FIG. 2 to FIG. 4.

In addition, the first rib portion 23A is a partition unit thatpartitions the inflow space 40A. The first rib portion 23A is formedfrom a substantially plate-shaped body, and is provided verticallybetween the outer cover body 21A and the top surface portion 22A.Specifically, as illustrated in FIG. 2 and FIG. 4, a plurality of firstrib portions 23A is provided radially from the vicinity of a center ofthe outer cover 20A, and is connected to the outer cover body 21A andthe top surface portion 22A.

In addition, the second rib portion 24A is a partition unit thatpartitions the inflow space 40A. The second rib portion 24A is formedfrom a substantially plate-shaped body, and is provided verticallybetween the outer cover body 21A and the top surface portion 22A.Specifically, as illustrated in FIG. 2 and FIG. 4, a plurality of secondrib portions 24A is provided between inner end portions of adjacentfirst rib portions 23A, and is connected to the outer cover body 21A andthe top surface portion 22A. Details of a configuration of the outercover 20A will be described below. In addition, the “outer cover 20A”corresponds to a “housing” in claims.

(Configuration—Inflow Space)

Returning to FIG. 2, the inflow space 40A is a space for allowing gasoutside the fire detection apparatus 1A to flow into the fire detectionapparatus 1A. A plurality of inflow spaces 40A is formed inside theouter cover 20A. Specifically, as illustrated in FIG. 2 and FIG. 4, aspace surrounded by the top surface portion 22A, the first rib portion23A, the second rib portion 24A, and the inner cover 30A in an internalspace of the outer cover 20A is formed as the inflow space 40A.

(Configuration—Inner Cover)

The inner cover 30A is a cover that covers the detection space 60A, thedetector cover 70A, the detector body 80A, and the substrate 100A, andis a partition unit that partitions the inflow space 40A. The innercover 30A is, for example, a substantially hollow cylindrical body whoseupper surface is open, is formed of a resin material having a lightshielding property, and is provided so that a lower surface of the innercover 30A faces the top surface portion 22A of the outer cover 20Athrough the inflow space 40A on the inside of the outer cover 20A asillustrated in FIG. 4. In addition, as illustrated in FIG. 4, a firstopening 30 aA is formed in the lower surface of the inner cover 30A. Thefirst opening 30 aA is an opening for sending gas flowing into theinflow space 40A to the detection space 60A, and is provided at asubstantially central portion and the vicinity thereof in the lowersurface of the inner cover 30A as illustrated in FIG. 4.

(Configuration—Detection Space)

The detection space 60A is a space for detecting a substance to bedetected. As illustrated in FIG. 4, a space surrounded by the detectorcover 70A and the detector body 80A in an internal space of the innercover 30A is formed as the detection space 60A.

(Configuration—Detector Cover)

The detector cover 70A is a partition unit that partitions the detectionspace 60A, and is an incidence suppression unit that suppressesincidence of ambient light into the detection space 60A. The detectorcover 70A is a substantially hollow cylindrical body whose upper surfaceis open, and is formed of a resin material having a light shieldingproperty. In addition, as illustrated in FIG. 4, the detector cover 70Ais disposed so that a lower surface of the detector cover 70A faces thetop surface portion 22A of the outer cover 20A through the first opening30 aA and the inflow space 40A on the inside of the inner cover 30A, andis fixed to the detector body 80A by a fitting structure, etc. Inaddition, as illustrated in FIG. 4, a second opening 70 aA is formed inthe lower surface of the detector cover 70A. The second opening 70 aA isan opening for allowing gas sent from the first opening 30 aA to flowinto the detection space 60A, and is provided at a portion correspondingto the first opening 30 aA on the lower surface of the detector cover70A as illustrated in FIG. 4.

(Configuration—Insect Screen)

The insect screen 50A is a net for preventing insects present outsidethe fire detection apparatus 1A from intruding into the detection space60A. The insect screen 50A is configured using a mesh-like and circularnet, and is attached to the detector cover 70A as illustrated in FIG. 4.

(Configuration—Detector Body)

The detector body 80A is an attaching unit that attaches the detectorcover 70A, and is an incidence suppression unit that suppressesincidence of ambient light into the detection space 60A. The detectorbody 80A is formed of, for example, a resin material having a lightshielding property, is disposed to cover an upper surface of thedetector cover 70A as illustrated in FIG. 4, and is fixed to thesubstrate 100A by a fixing tool, etc. In addition, the detector body 80Ais provided with a support (not illustrated) for supporting each of afirst light emitting unit (described below), a second light emittingunit (described below), and a light receiving unit (described below).Furthermore, each optical path hole (not illustrated) for forming anoptical path between the detection space 60A and each of the first lightemitting unit (described below), the second light emitting unit(described below), and the light receiving unit (described below) isformed in the detector body 80A.

(Configuration—Terminal Board)

The terminal board 90A is an accommodation unit that accommodates theinner cover 30A, the detector cover 70A, the detector body 80A, and thesubstrate 100A. The terminal board 90A has a substantially hollowcylindrical shape whose lower surface is open, and is formed of, forexample, a resin material having a light shielding property. Inaddition, as illustrated in FIG. 4, the terminal board 90A is providedto cover the inner cover 30A, the detector cover 70A, the detector body80A, and the substrate 100A from above, is fixed to the outer cover 20Aby a fitting structure, etc., and is fixed to the attachment base 10A bya fixing tool, etc. through a first attachment hole (not illustrated)formed in an attachment member 91A.

(Configuration—Substrate)

The substrate 100A is a mounting unit on which various electric circuits(not illustrated) are mounted. The substrate 100A is configured using,for example, a known flat plate-shaped circuit board, etc., is disposedsubstantially horizontally at a distance from an upper end portion and alower end portion of the terminal board 90A in the terminal board 90A asillustrated in FIG. 4, and is fixed to the terminal board 90A by afixing tool through an attachment hole (not illustrated) formed in theterminal board 90A and a second attachment hole (not illustrated) formedin the attachment member 91A.

Further, in addition to the fact that a known electronic component usedfor the conventional fire detection apparatus 1A is mounted on thesubstrate 100A, as illustrated in FIG. 4, the first light emitting unit(not illustrated), the second light emitting unit (not illustrated), thelight receiving unit (not illustrated), a heat detection unit 110A, adisplay unit (not illustrated), a communication unit (not illustrated),a power supply unit (not illustrated), a control unit (not illustrated),and a storage unit (not illustrated) are mounted on the substrate 100A.

(Configuration—Substrate—First Light Emitting Unit, Second LightEmitting Unit, and Light Receiving Unit)

Among these units, the first light emitting unit is a first lightemitting unit that irradiates the detection space 60A with detectionlight (hereinafter referred to as “first detection light”), and isconfigured using, for example, a known light emitting element (as anexample, an infrared light emitting diode (LED), etc.). In addition, thesecond light emitting unit is a second light emitting unit thatirradiates the detection space 60A with detection light (hereinafterreferred to as “second detection light”) having a different wavelengthfrom that of the first detection light, and is configured using, forexample, a known light emitting element (as an example, a blue LED,etc.). In addition, the light receiving unit is a light receiving unitthat receives scattered light of the first detection light irradiatedfrom the first light emitting unit due to smoke, outputs a first lightreceiving signal according to the received scattered light, receivesscattered light of the second detection light irradiated from the secondlight emitting unit with respect to smoke, and outputs a second lightreceiving signal according to the received scattered light, and isconfigured using, for example, a known light receiving element (as anexample, a photodiode, etc.). In addition, a method of installing thefirst light emitting unit, the second light emitting unit, and the lightreceiving unit is arbitrary. In Embodiment 1, installation is performedto be able to avoid direct reception of the first detection light or thesecond detection light irradiated from the first light emitting unit orthe second light emitting unit to the light receiving unit throughvarious optical path holes of the detector body 80A. For example, thefirst light emitting unit and the light receiving unit are installed ata position at which an angle between an optical axis of the first lightemitting unit (hereinafter referred to as a “first light emitting-sideoptical axis”) and an optical axis of the light receiving unit(hereinafter referred to as a “light receiving-side optical axis”) isabout 135°. In addition, the second light emitting unit and the lightreceiving unit are installed at a position at which an angle between anoptical axis of the second light emitting unit (hereinafter referred toas a “second light emitting-side optical axis”) and the lightreceiving-side optical axis is about 90°.

(Configuration—Substrate—Heat Detection Unit, Display Unit,Communication Unit, and Power Supply Unit)

Returning to FIG. 2, in addition, the heat detection unit 110A is a heatdetection unit that detects a fire. The heat detection unit 110A isconfigured using, for example, a known heat detection element (as anexample, a thermistor, etc.), and is disposed so that a part of the heatdetection unit 110A is exposed to the outside of the fire detectionapparatus 1A through an insertion hole (not illustrated) provided ineach of the inner cover 30A, the detector cover 70A, and the detectorbody 80A and an insertion hole 120A of the outer cover 20A describedbelow as illustrated in FIG. 2 to FIG. 4. In addition, the display unitis a display unit that displays predetermined information (for example,information indicating the presence or absence of detection of a fire)by irradiating light (hereinafter referred to as “display light”) to theoutside of the fire detection apparatus 1A, and is configured using, forexample, a known display unit (an LED, etc.). In addition, a lightprojection method of the display unit is arbitrary. Examples thereofinclude light projection by guiding display light from the display unittoward the outside of the fire detection apparatus 1A through a lightguide 104 aA inserted into an insertion hole (not illustrated) providedin each of the inner cover 30A, the detector cover 70A, and the detectorbody 80A and the insertion hole 120A of the outer cover 20A. Inaddition, the communication unit is a communication unit thatcommunicates with an external apparatus (for example, a receiver, etc.).The power supply unit is a power supply unit that supplies powersupplied from a commercial power supply or a battery (not illustrated)to each unit of the fire detection apparatus 1A.

(Configuration—Substrate—Control Unit and Storage Unit)

In addition, the control unit is a control unit that controls the firedetection apparatus 1A. Specifically, the control unit is a computerincluding a central processing unit (CPU) and an internal memory such asa random access memory (RAM) for storing various programs (including abasic control program such as the OS and an application programactivated on the OS to realize a specific function) to be interpretedand executed on the CPU, a program, and various data. In addition, thestorage unit is a storage unit that stores programs and various datanecessary for an operation of the fire detection apparatus 1A. Thestorage unit is configured using a rewritable recording medium. Forexample, it is possible to use a non-volatile recording medium such as aflash memory.

(Configuration—Details of Configuration of Outer Cover)

Returning to FIG. 2, next, a description will be given of details of aconfiguration of the outer cover 20A. However, the outer cover 20A maybe manufactured in an arbitrary shape using an arbitrary method andmaterial, unless otherwise specified.

In Embodiment 1, as illustrated in FIG. 2 to FIG. 4, the insertion hole120A and a guard portion 130A are provided in the top surface portion22A which is a side portion on the opposite side from a side portion onthe installation surface 2A side (opposite side portion) in sideportions of the outer cover 20A.

(Configuration—Details of Configuration of Outer Cover—Insertion Hole)

Returning to FIG. 3, the insertion hole 120A is a through-hole forexposing a part of the heat detection unit 110A to the outside of thefire detection apparatus 1A and irradiating display light from thedisplay unit to the outside of the fire detection apparatus 1A.

Here, a specific shape and size of the insertion hole 120A arearbitrary. In Embodiment 1, as illustrated in FIG. 3, a planar shape ofthe insertion hole 120A is set to a substantially elliptical shape (ormay be a polygonal shape such as a quadrangular shape). In addition, adiameter of the insertion hole 120A is set to a size that allows only apart of the heat detection unit 110A to be exposed to the outside andallows display light to be irradiated to the outside of the firedetection apparatus 1A. For example, the diameter is set to be longerthan a length obtained by adding a diameter of the heat detection unit110A to a diameter of the light guide 104 aA.

In addition, a method of forming the insertion hole 120A is arbitrary.The insertion hole 120A is formed in a portion other than a centralportion of the top surface portion 22A. Specifically, as illustrated inFIG. 3, the insertion hole 120A is formed in a right side portion on thetop surface portion 22A. In this case, for example, the heat detectionunit 110A and the display unit may be installed in a portioncorresponding to the insertion hole 120A or the vicinity thereof in aportion of the substrate 100A. According to such a formation method,when compared to a case in which the insertion hole 120A is formed inthe central portion of the top surface portion 22A, there are fewrestrictions on attachment of the heat detection unit 110A and thedisplay unit. Therefore, it is possible to maintain an attachmentproperty of the heat detection unit 110A and the display unit.

A part of the heat detection unit 110A may be accommodated in the outercover 20A by such an insertion hole 120A, another part of the heatdetection unit 110A may be exposed to the outside of the fire detectionapparatus 1A through the insertion hole 120A, and display light from thedisplay unit may be irradiated to the outside of the fire detectionapparatus 1A through the insertion hole 120A.

(Configuration—Details of Configuration of Outer Cover—Guard Portion)

Returning to FIG. 2, the guard portion 130A is a guard unit thatprotects the heat detection unit, and includes a first guard side rib131A, a second guard side rib 132A, a third guard side rib 133A, afourth guard side rib 134A, and a guard side connecting portion 135A asillustrated in FIG. 2 to FIG. 4.

(Configuration—Details of Configuration of Outer Cover—GuardPortion—First Guard Side Rib to Fourth Guard Side Rib)

Returning to FIG. 2, the first guard side rib 131A, the second guardside rib 132A, the third guard side rib 133A, and the fourth guard siderib 134A correspond to a basic structure of the guard portion 130A. Eachof the first guard side rib 131A, the second guard side rib 132A, thethird guard side rib 133A, and the fourth guard side rib 134A is formedof a long plate-shaped body, and is provided to cover the periphery ofthe insertion hole 120A and a portion of the heat detection unit 110Aexposed to the outside of the fire detection apparatus 1A as illustratedin FIG. 2 to FIG. 4. Specifically, the first guard side rib 131A, thesecond guard side rib 132A, the third guard side rib 133A, and thefourth guard side rib 134A are provided such that a longitudinaldirection thereof extends substantially along the vertical direction (isslightly inclined in FIG. 3), and are vertically arranged with respectto a lower surface of the top surface portion 22A.

(Configuration—Details of Configuration of Outer Cover—GuardPortion—Guard Side Connecting Portion)

Returning to FIG. 2, the guard side connecting portion 135A is aconnecting unit that connects the first guard side rib 131A, the secondguard side rib 132A, the third guard side rib 133A, and the fourth guardside rib 134A. The guard side connecting portion 135A is formed of, forexample, the same material as that of the outer cover 20A, and isconnected to the vicinity of upper end portions of the first guard siderib 131A, the second guard side rib 132A, the third guard side rib 133A,and the fourth guard side rib 134A as illustrated in FIG. 2 to FIG. 4.

According to such a configuration, it is possible to inhibit theinsertion hole 120A from being exposed to the outside of the firedetection apparatus 1A by the guard portion 130A, and to maintain adesign property of the fire detection apparatus 1A without impairing aninflow property of an air flow to the guard portion 130A.

(Configuration—Details of Configuration of Outer Cover—GuardPortion—Details of Configurations of First Guard Side Rib to FourthGuard Side Rib)

Next, a description will be given of details of configurations of thefirst guard side rib 131A, the second guard side rib 132A, the thirdguard side rib 133A, and the fourth guard side rib 134A.

First, a material of each of the first guard side rib 131A, the secondguard side rib 132A, the third guard side rib 133A, and the fourth guardside rib 134A is arbitrary. In Embodiment 1, a material of some ribsamong the first guard side rib 131A, the second guard side rib 132A, thethird guard side rib 133A, and the fourth guard side rib 134A isdifferent from a material of some other ribs. Specifically, the firstguard side rib 131A is formed of a translucent material (as an example,a translucent resin material, a glass material, etc.), and the secondguard side rib 132A, the third guard side rib 133A, and the fourth guardside rib 134A are formed of the same material as that of the outer cover20A.

According to such a configuration, by forming only the first guard siderib 131A using the translucent material, it is possible to guide displaylight irradiated from the display unit accommodated in the outer cover20A to the outside of the fire detection apparatus 1A through the firstguard side rib 131A and the insertion hole 120A. Therefore, since thereis no need to provide the display hole for guiding display light to theoutside in the outer cover 20A, it is possible to maintain the designproperty of the fire detection apparatus 1A when compared to aconventional technology (a technology in which the protector and thedisplay hole are exposed to the outside).

In addition, specific configurations of the first guard side rib 131A,the second guard side rib 132A, the third guard side rib 133A, and thefourth guard side rib 134A are arbitrary. In Embodiment 1, the guardside ribs are configured such that display light irradiated from thedisplay unit is guided to the outside of the fire detection apparatus 1Athrough the first guard side rib 131A. More specifically, the guard sideribs are configured such that display light can be visually recognizedwhen a person looks up at the fire detection apparatus 1A under apredetermined condition. Here, the “predetermined condition” isarbitrary. In Embodiment 1, as illustrated in FIG. 1, the predeterminedcondition corresponds to the fact that the fire detection apparatus 1Ais installed on the ceiling portion at a height H1A of the installationsurface 2A (as an example, 2.4 m), a person HMA is present within apredetermined distance DA (as an example, within 3.0 m, etc.) from thefire detection apparatus 1A, and a height H2A of eyes of the person HMAis lower than the height H1A of the installation surface 2A (as anexample, 1.8 m, etc.).

Specifically, first, the first guard side rib 131A, the second guardside rib 132A, the third guard side rib 133A, and the fourth guard siderib 134A are provided adjacent to the insertion hole 120A. Morespecifically, as illustrated in FIG. 3, the first guard side rib 131A isdisposed on the right side of the insertion hole 120A, the second guardside rib 132A is disposed on the left side of the insertion hole 120A,the third guard side rib 133A is disposed on the front side and to theright of the insertion hole 120A, and the fourth guard side rib 134A isdisposed on the back side and to the right of the insertion hole 120A.

According to such a configuration, the person can visually recognize thedisplay light at the time of looking up at the fire detection apparatus1A under the predetermined condition. Further, in particular, whileensuring the strength of the guard portion 130A, the first guard siderib 131A may be allowed to function as a light guide, and the displaylight can be easily visually recognized in various directions.

In addition, shapes of the first guard side rib 131A, the second guardside rib 132A, the third guard side rib 133A, and the fourth guard siderib 134A (specifically, forms of the ribs or sizes of the ribs) arearbitrary. In Embodiment 1, among the first guard side rib 131A, thesecond guard side rib 132A, the third guard side rib 133A, and thefourth guard side rib 134A, a shape of some of the ribs is differentfrom a shape of some other ribs. Specifically, as illustrated in FIG. 2and FIG. 4, vertical lengths of the first guard side rib 131A, thesecond guard side rib 132A, the third guard side rib 133A, and thefourth guard side rib 134A are set to be longer than a vertical lengthof a portion of the heat detection unit 11A exposed to the outside ofthe fire detection apparatus 1A. In addition, in Embodiment 1, widths ofthe first guard side rib 131A, the second guard side rib 132A, the thirdguard side rib 133A, and the fourth guard side rib 134A are set on thebasis of an experimental result, etc. so that an air flow flowing intoward the guard portion 130A from each direction can be uniformized. Asan example, as illustrated in FIG. 2 and FIG. 4, the widths may be setto be shorter than a diameter of the insertion hole 120A, and the widthof the second guard side rib 132A may be set to be narrower than thewidths of the other ribs. In addition, in Embodiment 1, thicknesses ofthe first guard side rib 131A, the second guard side rib 132A, the thirdguard side rib 133A, and the fourth guard side rib 134A are set on thebasis of an inflow or an inflow direction of an air flow flowing intothe guard portion 130A. For example, the thicknesses may be set on thebasis of an experimental result, etc. so that the air flow flowing intoward the guard portion 130A from each direction can be uniformized. Asan example, the thickness of the second guard side rib 132A may be setto be thinner than the thicknesses of the other ribs. In addition, thethicknesses of the third guard side rib 133A and the fourth guard siderib 134A may be set to be thicker than the thickness of the second guardside rib 132A. In addition, the thickness of the first guard side rib131A may be set to be thicker than the thicknesses of the other ribs.

According to such a configuration, when compared to a case in which aplurality of ribs is formed in the same shape, it is easy to uniformizethe inflow of the air flow flowing into the guard portion 130A from eachdirection in accordance with the installation state of the firedetection apparatus 1A. Therefore, it is possible to improve an inflowproperty of an air flow in the fire detection apparatus 1A. In addition,it is possible to set thicknesses of a plurality of ribs according tothe inflow or the inflow direction of the air flow flowing into theguard portion 130A, and it is possible to ensure an inflow property ofthe air flow to the guard portion 130A while maintaining durability ofthe guard portion 130A. In addition, since the first guard side rib 131Ais a rib thicker than a thinnest rib among the plurality of ribs(specifically, is a thickest rib), display light irradiated from thedisplay unit is easily guided to the outside of the fire detectionapparatus 1A while suppressing damage to the first guard side rib 131A,etc. Thus, it is possible to further maintain a display function of thefire detection apparatus 1A while improving durability of the firstguard side rib 131A. In particular, the first guard side rib 131A isdisposed at a position farthest from the central portion of the topsurface portion 22A, and thus contributes to improvement ofuniformization of the inflow of the air flow flowing in from eachdirection in the guard portion 130A, the design property of the firedetection apparatus 1A, and durability of the guard portion 130A bysetting the thickness of the first guard side rib 131A as describedabove. In addition, since the second guard side rib 132A is a ribthinner than a thickest rib among the plurality of ribs (specifically, athinnest rib) and is a rib narrower than a widest rib (specifically, anarrowest rib), when the insertion hole 120A is provided in a portionother than the central portion of the top surface portion 22A, itbecomes easier to uniformize the inflow of the air flow flowing in fromeach direction in the guard portion 130A. Thus, it is possible toimprove the inflow property of the air flow to the guard portion 130A.

A method of forming the guard portion 130A described above is arbitrary.In Embodiment 1, the first guard side rib 131A is formed separately fromthe second guard side rib 132A, the third guard side rib 133A, thefourth guard side rib 134A, and the guard side connecting portion 135A.Specifically, the first guard side rib 131A is formed byinjection-molding a translucent resin material, and the outer cover 20A,the second guard side rib 132A, the third guard side rib 133A, thefourth guard side rib 134A, and the guard side connecting portion 135Aare integrally formed by injection-molding a resin material having alight shielding property. Thereafter, the first guard side rib 131A isconnected to the outer cover 20A and the guard side connecting portion135A by a fitting structure, etc., thereby forming the guard portion130A.

(With Regard to Action of Fire Detection Apparatus)

Next, a description will be given of an action of the fire detectionapparatus 1A configured as described above.

That is, for example, in a state in which the fire detection apparatus1A is attached to the installation surface 2A, the insertion hole 120Ais covered by the guard portion 130A, and thus it is possible to inhibitthe insertion hole 120A from being exposed to the outside of the firedetection apparatus 1A.

In addition, for example, when display light is irradiated from thedisplay unit in the state in which the fire detection apparatus 1A isattached to the installation surface 2A, display light irradiated fromthe display unit is guided to the outside of the fire detectionapparatus 1A through the first guard side rib 131A, and thus the firstguard side rib 131A may be allowed to function as the light guide 104aA.

Effect of Embodiment 1

As described above, according to Embodiment 1, since the material of thefirst guard side rib 131A among the first guard side rib 131A to thefourth guard side rib 134A is made different from the material of someother ribs, for example, it is possible to guide light irradiated fromthe display unit accommodated in the outer cover 20A to the outside ofthe fire detection apparatus 1A through the first guard side rib 131Aand the insertion hole 120A by forming only the first guard side rib131A using the translucent material. Therefore, since there is no needto provide the display hole for guiding light irradiated from thedisplay unit to the outside in the outer cover 20A, it is possible tomaintain the design property of the fire detection apparatus 1A whencompared to a conventional technology (a technology in which theprotector and the display hole are exposed to the outside). In addition,since the shape of the first guard side rib 131A among the first guardside rib 131A to the fourth guard side rib 134A is made different fromthe shape of some other ribs, when compared to a case in which the firstguard side rib 131A to the fourth guard side rib 134A are formed in thesame shape, it is easy to uniformize the inflow of the air flow flowinginto the guard portion 130A from each direction in accordance with theinstallation state of the fire detection apparatus 1A. Therefore, it ispossible to improve the inflow property of the air flow in the firedetection apparatus 1A.

In addition, since only the first guard side rib 131A is formed of thetranslucent material, and the first guard side rib 131A to the fourthguard side rib 134A are configured such that light irradiated from thedisplay unit is guided to the outside of the fire detection apparatus 1Athrough the first guard side rib 131A, the first guard side rib 131A maybe allowed to function as the light guide 104 aA while ensuring thestrength of the guard portion 130A, and light irradiated from thedisplay unit can be easily visually recognized in various directions.

In addition, since the thicknesses of the first guard side rib 131A tothe fourth guard side rib 134A are set on the basis of the inflow or theinflow direction of the air flow flowing into the guard portion 130A, itis possible to set the thicknesses of the first guard side rib 131A tothe fourth guard side rib 134A based on the inflow or the inflowdirection of the air flow flowing into the guard portion 130A, and it ispossible to ensure the inflow property of the air flow to the guardportion 130A while maintaining the durability of the guard portion 130A.

In addition, since the first guard side rib 131A is a rib thicker than athinnest rib among the first guard side rib 131A to the fourth guardside rib 134A, light irradiated from the display unit is easily guidedto the outside of the fire detection apparatus 1A while suppressingdamage to the first guard side rib 131A, etc. Thus, it is possible tofurther maintain the display function of the fire detection apparatus 1Awhile improving durability of the first guard side rib 131A.

In addition, the insertion hole 120A is provided in a portion other thanthe central portion in a part of the top surface portion 22A. Thus, whencompared to the case in which the insertion hole 120A is formed in thecentral portion of the top surface portion 22A, there are fewrestrictions on attachment of the heat detection unit 110A and thedisplay unit. Therefore, it is possible to maintain an attachmentproperty of the heat detection unit 110A and the display unit.

In addition, since the second guard side rib 132A is a rib thinner thana thickest rib and is a rib narrower than a widest rib among the firstguard side rib 131A to the fourth guard side rib 134A, when theinsertion hole 120A is provided in a portion other than the centralportion of the top surface portion 22A, it becomes easier to uniformizethe inflow of the air flow flowing in from each direction in the guardportion 130A. Thus, it is possible to improve the inflow property of theair flow to the guard portion 130A.

Embodiment 2

Next, a fire detection apparatus according to Embodiment 2 will bedescribed. Embodiment 2 corresponds to a mode in which a partition walldescribed below is provided in a housing.

(Configuration)

First, a description will be given of a configuration of the firedetection apparatus according to Embodiment 2. FIG. 5 is a side viewillustrating an attachment state of the fire detection apparatusaccording to Embodiment 2. FIG. 6 is a diagram illustrating the firedetection apparatus in a state of removing an attachment base describedbelow, in which FIG. 6(a) is a plan view and FIG. 6(b) is a bottom view.FIG. 7 is a cross-sectional view taken along A-A line of FIG. 6(b). FIG.8 is a diagram illustrating an inner cover 30B, in which FIG. 8(a) is aplan view and FIG. 8(b) is a bottom view. In the following description,an X direction of FIG. 5 is referred to as a left-right direction of thefire detection apparatus (a +X direction is a left direction of the firedetection apparatus and a −X direction is a right direction of the firedetection apparatus), a Y direction of FIG. 6 is referred to as afront-back direction of the fire detection apparatus (a +Y direction isa frontward direction of the fire detection apparatus and a −Y directionis a backward direction of the fire detection apparatus), and a Zdirection of FIG. 5 is referred to as a vertical direction of the firedetection apparatus (a +Z direction is an upward direction of the firedetection apparatus and a −Z direction is a downward direction of thefire detection apparatus).

The fire detection apparatus 1B is installed on an installation surface2B on a lower surface of a ceiling portion of a building in an interiorof the building as illustrated in FIG. 5, and includes an attachmentbase 10B, an outer cover 20B, an inner cover 30B, an inflow space 40B,an insect screen 50B, a carbon monoxide detection space 61B, a heatdetection space 62B, a smoke detection space 63B, a detector cover 70B,a detector body 80B, a terminal board 90B, and a substrate 100B asillustrated in FIG. 5 to FIG. 7. A space including the “inflow space40B”, the “carbon monoxide detection space 61B”, and the “smokedetection space 63B” corresponds to a “first detection space” in theclaims.

(Configuration—Attachment Base)

Returning to FIG. 5, the attachment base 10B is an attaching unit thatattaches the outer cover 20B to the installation surface 2B. Theattachment base 10B is configured using, for example, a known attachmentbase for the fire detection apparatus (as an example, a substantiallyplate-shaped attachment base made of resin), etc., and is fixed to theinstallation surface 2B by a fixing tool, etc. as illustrated in FIG. 5.

(Configuration—Outer Cover)

The outer cover 20B is a cover that covers the inner cover 30B, theinflow space 40B, the insect screen 50B, the carbon monoxide detectionspace 61B, the smoke detection space 63B, the detector cover 70B, thedetector body 80B, the terminal board 90B, and the substrate 100B. Theouter cover 20B is formed of, for example, a resin material having alight shielding property, and includes an outer cover body 21B, a topsurface portion 22B, a first rib portion 23B, and a second rib portion24B as illustrated in FIG. 5 to FIG. 7.

Among these portions, the outer cover body 21B is a basic structure ofthe outer cover 20B. The outer cover body 21B is formed of, for example,a substantially hollow cylindrical body whose upper surface and lowersurface are open, is disposed so that an upper end portion of the outercover body 21B comes into contact with a lower surface of the attachmentbase 10B as illustrated in FIG. 5, and is fixed to the attachment base10B by a fitting structure (or a fixing tool), etc.

In addition, the top surface portion 22B is a partition unit thatpartitions the inflow space 40B. The top surface portion 22B is formedof, for example, a substantially circular plate-shaped body, and isprovided substantially horizontally below the outer cover body 21B asillustrated in FIG. 5 to FIG. 7.

In addition, the first rib portion 23B is a partition unit thatpartitions the inflow space 40B. The first rib portion 23B is formedfrom a substantially plate-shaped body, and is provided verticallybetween the outer cover body 21B and the top surface portion 22B.Specifically, as illustrated in FIG. 5 and FIG. 7, a plurality of firstrib portions 23B is provided radially from the vicinity of a center ofthe outer cover 20B, and is connected to the outer cover body 21B andthe top surface portion 22B.

In addition, the second rib portion 24B is a partition unit thatpartitions the inflow space 40B. The second rib portion 24B is formedfrom a substantially plate-shaped body, and is provided verticallybetween the outer cover body 21B and the top surface portion 22B.Specifically, as illustrated in FIG. 5 and FIG. 7, a plurality of secondrib portions 24B is provided between inner end portions of adjacentfirst rib portions 23B, and is connected to the outer cover body 21B andthe top surface portion 22B. Details of a configuration of the outercover 20B will be described below.

(Configuration—Inflow Space)

Returning to FIG. 5, the inflow space 40B is a space for allowing smokefrom the outside of the fire detection apparatus 1B or gas containingcarbon monoxide to flow into the fire detection apparatus 1B. Aplurality of inflow spaces 40B is formed inside the outer cover 20B.Specifically, as illustrated in FIG. 5 and FIG. 7, a space surrounded bythe top surface portion 22B, the first rib portion 23B, the second ribportion 24B, and the inner cover 30B in an internal space of the outercover 20B is formed as the inflow space 40B. The “smoke” and “carbonmonoxide” described above correspond to a “first detection target” inthe claims.

(Configuration—Inner Cover)

The inner cover 30B is a cover that covers the carbon monoxide detectionspace 61B, the smoke detection space 63B, the detector cover 70B, thedetector body 80B, and the substrate 100B, and is a partition unit thatpartitions the inflow space 40B. The inner cover 30B is, for example, asubstantially hollow cylindrical body whose upper surface is open, isformed of a resin material having a light shielding property, and isprovided so that a lower side portion of the inner cover 30B faces thetop surface portion 22B of the outer cover 20B through the inflow space40B on the inside of the outer cover 20B as illustrated in FIG. 7.

In addition, as illustrated in FIG. 7 and FIG. 8, a first opening 30 aBand an inflow hole 30 bB are formed in the lower side portion of theinner cover 30B. The first opening 30 aB is an opening for sending gasflowing into the inflow space 40B to the smoke detection space 63B, andis provided at a substantially central portion and the vicinity thereofin the lower side portion of the inner cover 30B as illustrated in FIG.7. In addition, the inflow hole 30 bB is an opening for sending gasflowing into the inflow space 40B to the carbon monoxide detection space61B. As illustrated in FIG. 8, one inflow hole 30 bB is provided in theinner cover 30B. Specifically, the inflow hole 30 bB is provided in aportion facing the carbon monoxide detection space 61B in the lower sideportion of the inner cover 30B. Details of a configuration of the innercover 30B will be described below. In addition, the “outer cover 20B”and the “inner cover 30B” described above correspond to a “housing” inthe claims.

(Configuration—Carbon Monoxide Detection Space)

The carbon monoxide detection space 61B is a first detection space bodyin which carbon monoxide is detected. As illustrated in FIG. 8, a spacesurrounded by a first partition wall 150B described below and thesubstrate 100B in a space located inside the inner cover 30B is formedas the carbon monoxide detection space 61B.

(Configuration—Heat Detection Space)

Returning to FIG. 7, the heat detection space 62B is a second detectionspace for performing detection of heat. As illustrated in FIG. 7, aspace located near an insertion hole 120B described below in a spacelocated outside the outer cover 20B is formed as the heat detectionspace 62B. The “heat” corresponds to a “second detection target” in theclaims.

(Configuration—Smoke Detection Space)

The smoke detection space 63B is the first detection space body in whichsmoke is detected. As illustrated in FIG. 7, a space surrounded by thedetector cover 70B and the detector body 80B in the space located insidethe inner cover 30B is formed as the smoke detection space 63B.

(Configuration—Detector Cover)

The detector cover 70B is a partition unit that partitions the smokedetection space 63B, and is an incidence suppression unit that inhibitsambient light from entering the smoke detection space 63B. The detectorcover 70B is a substantially hollow cylindrical body whose upper surfaceis open, and is formed of a resin material having a light shieldingproperty. In addition, as illustrated in FIG. 7, the detector cover 70Bis disposed such that a lower side portion of the detector cover 70Bfaces the top surface portion 22B of the outer cover 20B through thefirst opening 30 aB and the inflow space 40B on the inside of the innercover 30B, and is fixed to the detector body 80B by a fitting structure,etc. In addition, as illustrated in FIG. 7, a second opening 70 aB isformed in the lower side portion of the detector cover 70B. The secondopening 70 aB is an opening for allowing gas sent from the first opening30 aB to flow into the smoke detection space 63B, and is provided in aportion corresponding to the first opening 30 aB in the lower sideportion of the detector cover 70B as illustrated in FIG. 7.

(Configuration—Insect Screen)

The insect screen 50B is a net for preventing insects present outsidethe fire detection apparatus 1B from intruding into the smoke detectionspace 63B. The insect screen 50B is configured using a mesh-like andcircular net, and is attached to the detector cover 70B as illustratedin FIG. 7.

(Configuration—Detector Body)

The detector body 80B is an attaching unit that attaches the detectorcover 70B, and is an incidence suppression unit that suppressesincidence of ambient light into the smoke detection space 63B. Thedetector body 80B is formed of, for example, a resin material having alight shielding property, is disposed to cover an upper surface of thedetector cover 70B as illustrated in FIG. 7, and is fixed to thesubstrate 100B by a fixing tool, etc. In addition, the detector body 80Bis provided with a support (not illustrated) for supporting each of thefirst light emitting unit (described below), the second light emittingunit (described below), and the light receiving unit (described below).Furthermore, each optical path hole (not illustrated) for forming anoptical path between the smoke detection space 63B and each of the firstlight emitting unit (described below), the second light emitting unit(described below), and the light receiving unit (described below) isformed in the detector body 80B.

(Configuration—Terminal Board)

The terminal board 90B is an accommodation unit that accommodates theinner cover 30B, the detector cover 70B, the detector body 80B, and thesubstrate 100B. The terminal board 90B has a substantially hollowcylindrical shape whose lower surface is open, and is formed of, forexample, a resin material having a light shielding property. Inaddition, as illustrated in FIG. 7, the terminal board 90B is providedto cover the inner cover 30B, the detector cover 70B, the detector body80B, and the substrate 100B from above, is fixed to the outer cover 20Bby a fitting structure, etc., and is fixed to the attachment base 10B bya fixing tool, etc. through a first attachment hole 91 aB formed in anattachment member 91B.

(Configuration—Substrate)

The substrate 100B is a mounting unit on which various electric circuits(not illustrated) are mounted. The substrate 100B is configured using,for example, a known flat plate-shaped circuit board, etc., is disposedsubstantially horizontally at a distance from an upper end portion and alower end portion of the terminal board 90B in the terminal board 90B asillustrated in FIG. 7, and is fixed to the terminal board 90B by afixing tool through an attachment hole (not illustrated) formed in theterminal board 90B and a second attachment hole 91 bB formed in theattachment member 91B.

Further, in addition to the fact that a known electronic component usedfor the conventional fire detection apparatus 1B is mounted on thesubstrate 100B, as illustrated in FIG. 7, a smoke detection unit (notillustrated), a carbon monoxide detection unit (not illustrated), a heatdetection unit 110B, a display unit (not illustrated), a communicationunit (not illustrated), a power supply unit (not illustrated), a controlunit (not illustrated), and a storage unit (not illustrated) are mountedon the substrate 100B.

(Configuration—Substrate Smoke Detection Unit)

Among these units, the smoke detection unit is a first detection targetdetecting unit that detects smoke. The smoke detection unit isconfigured using, for example, a known smoke detecting unit, andincludes the first light emitting unit, the second light emitting unit,and the light receiving unit (none of which are illustrated). Here, thefirst light emitting unit is a first light emitting unit that irradiatesthe smoke detection space 63B with detection light (hereinafter referredto as “first detection light”), and is configured using, for example, aknown light emitting element (as an example, an infrared LED, etc.). Inaddition, the second light emitting unit is a second light emitting unitthat irradiates the smoke detection space 63B with detection light(hereinafter referred to as “second detection light”) having a differentwavelength from that of the first detection light, and is configuredusing, for example, a known light emitting element (as an example, ablue LED, etc.). In addition, the light receiving unit is a lightreceiving unit that receives scattered light of the first detectionlight irradiated from the first light emitting unit due to smoke,outputs a first light receiving signal according to the receivedscattered light, receives scattered light of the second detection lightirradiated from the second light emitting unit with respect to smoke,and outputs a second light receiving signal according to the receivedscattered light, and is configured using, for example, a known lightreceiving element (as an example, a photodiode, etc.). In addition, amethod of installing the first light emitting unit, the second lightemitting unit, and the light receiving unit is arbitrary. In Embodiment2, installation is performed to be able to avoid direct reception of thefirst detection light or the second detection light irradiated from thefirst light emitting unit or the second light emitting unit to the lightreceiving unit through various optical path holes of the detector body80B. For example, the first light emitting unit and the light receivingunit are installed at a position at which an angle between an opticalaxis of the first light emitting unit (hereinafter referred to as a“first light emitting-side optical axis”) and an optical axis of thelight receiving unit (hereinafter referred to as a “light receiving-sideoptical axis”) is about 135°. In addition, the second light emittingunit and the light receiving unit are installed at a position at whichan angle between an optical axis of the second light emitting unit(hereinafter referred to as a “second light emitting-side optical axis”)and the light receiving-side optical axis is about 90°.

(Configuration—Substrate—Carbon Monoxide Detection Unit and HeatDetection Unit)

In addition, the carbon monoxide detection unit is a first detectiontarget detecting unit that detects carbon monoxide. The carbon monoxidedetection unit is configured using, for example, a known carbon monoxidedetection element (as an example, a CO sensor, etc.), and is provided ina portion corresponding to the inflow hole 30 bB in a portion of thesubstrate 100B (that is, is provided at a position close to the inflowhole 31 bB on the inside of the inner cover 30B). In addition, the heatdetection unit 110B is a second detection target detecting unit thatdetects heat. The heat detection unit 110B is configured using, forexample, a known heat detection element (as an example, a thermistor,etc.), and is disposed so that a part of the heat detection unit 110B isinserted into the heat detection space 62B through an insertion hole(not illustrated) provided in each of the detector cover 70B and thedetector body 80B, an insertion hole 140 aB of the inner cover 30Bdescribed below, and the insertion hole 120B of the outer cover 20Bdescribed below as illustrated in FIG. 7.

(Configuration—Substrate—Display Unit, Communication Unit, and PowerSupply Unit)

In addition, the display unit is a display unit that displayspredetermined information (for example, information indicating thepresence or absence of detection of a fire) by irradiating light(hereinafter referred to as “display light”) to the outside of the firedetection apparatus 1B, and is configured using, for example, a knowndisplay unit (an LED, etc.). In addition, a light projection method ofthe display unit is arbitrary. Examples thereof include light projectionby guiding display light from the display unit toward the outside of thefire detection apparatus 1B through a light guide (not illustrated)inserted into an insertion hole (not illustrated) provided in each ofthe detector cover 70B and the detector body 80B, an insertion hole 140bB of the inner cover 30B described below, and the insertion hole 120Bof the outer cover 20B described below. In addition, the communicationunit is a communication unit that communicates with an externalapparatus (for example, a receiver, etc.). In addition, the power supplyunit is a power supply unit that supplies power supplied from acommercial power supply or a battery (not illustrated) to each unit ofthe fire detection apparatus 1B.

(Configuration—Substrate—Control Unit and Storage Unit)

In addition, the control unit is a control unit that controls the firedetection apparatus 1B. Specifically, the control unit is a computerincluding a CPU and an internal memory such as a RAM for storing variousprograms (including a basic control program such as the OS and anapplication program activated on the OS to realize a specific function)to be interpreted and executed on the CPU, a program, and various data.In addition, the storage unit is a storage unit that stores programs andvarious data necessary for an operation of the fire detection apparatus1B. The storage unit is configured using a rewritable recording medium.For example, it is possible to use a non-volatile recording medium suchas a flash memory.

(Configuration—Details of Configuration of Outer Cover)

Returning to FIG. 5, next, a description will be given of details of aconfiguration of the outer cover 20B. However, the outer cover 20B maybe manufactured in an arbitrary shape using an arbitrary method andmaterial, unless otherwise specified.

In Embodiment 2, as illustrated in FIG. 5 to FIG. 7, the insertion hole120B and a guard portion 130B are provided in the top surface portion22B which is a side portion on the opposite side from a side portion onthe installation surface 2B side in side portions of the outer cover20B.

(Configuration—Details of Configuration of Outer Cover—Insertion Hole)

The insertion hole 120B is a through-hole for inserting a part of theheat detection unit 110B into the heat detection space 62B andirradiating display light from the display unit to the outside of thefire detection apparatus 1B.

Here, a specific shape and size of the insertion hole 120B arearbitrary. In Embodiment 2, as illustrated in FIG. 6(b), a planar shapeof the insertion hole 120B is set to a substantially elliptical shape(or may be a polygonal shape such as a quadrangular shape). In addition,a diameter of the insertion hole 120B is set to a size that allows onlya part of the heat detection unit 110B to be exposed to the heatdetection space 62B and allows display light to be irradiated to theoutside of the fire detection apparatus 1B. For example, the diameter isset to be longer than a length obtained by adding a diameter of the heatdetection unit 110B to a diameter of the light guide.

In addition, a method of forming the insertion hole 120B is arbitrary.The insertion hole 120B is formed in a portion facing the inflow space40B. Specifically, as illustrated in FIG. 6(b), the insertion hole 120Bis formed in a right side portion on the top surface portion 22B. Inthis case, for example, the heat detection unit 110B and the displayunit may be installed in a portion corresponding to the insertion hole120B or the vicinity thereof in a portion of the substrate 100B.According to such a formation method, when compared to a case in whichthe insertion hole 120B is formed in the central portion of the topsurface portion 22B, there are few restrictions on attachment of theheat detection unit 110B and the display unit. Therefore, it is possibleto maintain an attachment property of the heat detection unit 110B andthe display unit.

By such an insertion hole 120B, a part of the heat detection unit 110Bmay be inserted into the heat detection space 62B through insertion hole120B, and display light from the display unit may be irradiated to theoutside of the fire detection apparatus 1B through the insertion hole120B.

(Configuration—Details of Configuration of Outer Cover—Guard Portion)

Returning to FIG. 5, the guard portion 130B is a guard unit thatprotects the heat detection unit. As illustrated in FIG. 5 to FIG. 7,the guard portion 130B is provided to cover a periphery of the insertionhole 120B and a portion of the heat detection unit 110B exposed to theoutside of the fire detection apparatus 1B. In addition, the guardportion 130B is configured by combining a plurality of long ribs 131B(hereinafter referred to as “guard side ribs 131B”). Specifically, asillustrated in FIG. 5 to FIG. 7, the guard portion 130B is provided suchthat a longitudinal direction of each of the plurality of guard sideribs 131B extends substantially along the vertical direction (isslightly inclined in FIG. 6(b) and FIG. 7), and is vertically arrangedwith respect to a lower surface of the top surface portion 22B with aninterval therebetween.

According to such a configuration, it is possible to inhibit theinsertion hole 120B from being exposed to the outside of the firedetection apparatus 1B by the guard portion 130B, and it is possible tomaintain the design property of the fire detection apparatus 1B withoutimpairing the inflow property of gas to the guard portion 130B.

(Configuration—Details of Configuration of Inner Cover)

Next, a description will be given of details of the configuration of theinner cover 30B. However, the inner cover 30B may be manufactured in anarbitrary shape using an arbitrary method and material, unless otherwisespecified.

In Embodiment 2, as illustrated in FIG. 8, the insertion hole 140 aB,the insertion hole 140 bB, the first partition wall 150B, and a secondpartition wall 160B are provided in the inner cover 30B.

(Configuration—Details of Configuration of Inner Cover—Insertion Hole)

The insertion hole 140 aB is a through-hole for inserting a part of theheat detection unit 110B into the heat detection space 62B, and theinsertion hole 140 bB is a through-hole for irradiating display lightfrom the display unit to the outside of the fire detection apparatus 1B.As illustrated in FIG. 8, the insertion holes 140 aB and 140 bB areprovided in portions of the lower side portion of the inner cover 30Bfacing the inflow space 40B and corresponding to the insertion hole120B, respectively.

(Configuration—Details of Configuration of Inner Cover—First PartitionWall)

The first partition wall 150B is a partition wall for partitioning thecarbon monoxide detection space 61B so that gas flowing into the carbonmonoxide detection space 61B is inhibited from flowing out to the heatdetection space 62B. As illustrated in FIG. 8, the first partition wall150B is provided to protrude upward from the lower side portion of theinner cover 30B on the inside of the inner cover 30B.

In addition, a specific configuration of the first partition wall 150Bis arbitrary. In Embodiment 2, the first partition wall 150B isconfigured to surround at least a part of a periphery of the carbonmonoxide detection unit and the inflow hole 30 bB in the carbon monoxidedetection space 61B. Specifically, as illustrated in FIG. 8, the firstpartition wall 150B is formed from a plate-shaped body whose planarshape is a U-shape (or an arc shape, etc.) which is open toward theouter side of the inner cover 30B, and is disposed such that a portionof an outer periphery of the carbon monoxide detection unit other than aportion on the outer cover body 21B side is covered by the firstpartition wall 150B. As illustrated in FIG. 8(a), even though a part (inFIG. 8(a), a portion on the outer cover body 21B side) of a side portionprotruding upward from the lower side portion in side portions of theinner cover 30B (hereinafter referred to as a “peripheral side portion”)is notched, since the notched part is covered by the outer cover body21B, it is possible to prevent gas flowing into the carbon monoxidedetection space 61B from flowing out to the outside through the notchedpart.

According to such a configuration, it is possible to inhibit gas flowinginto the carbon monoxide detection space 61B from flowing out to theheat detection space 62B. Therefore, when compared to a case in whichthe first partition wall 150B is not provided, it is possible to preventdetection of the heat detection unit 110B from being inhibited by thegas that has flowed in, and it is possible to maintain or improve heatdetection accuracy. In particular, since the first partition wall 150Bis configured to surround the part of the periphery of the carbonmonoxide detection unit and the inflow hole 30 bB in the carbon monoxidedetection space 61B, it is possible to effectively inhibit gas flowinginto the carbon monoxide detection space 61B from flowing out to theheat detection space 62B through the inflow hole 30 bB, and heatdetection accuracy is easily maintained. Here, the statement that“detection of the heat detection unit 110B is inhibited by the gas thathas flowed in” corresponds to, for example, a fact that when gas flowingin from the carbon monoxide detection space 61B flows out from the heatdetection space 62B (that is, when an air flow from the carbon monoxidedetection space 61B side to the heat detection unit 110B is generated),an external atmosphere is disturbed by the air flow, and the heatdetection space 62B and the heat detection unit 110B are not directlyreached, a fact that when air permeability of the heat detection space62B is increased by gas flowing in from the carbon monoxide detectionspace 61B, even if an external atmosphere containing heat flows into theheat detection space 62B, the external atmosphere easily blowstherethrough, and thus a time when the external atmosphere stays in theheat detection space 62B shortens, etc.

(Configuration—Details of Configuration of Inner Cover—Second PartitionWall)

The second partition wall 160B is a partition wall for partitioning theheat detection space 62B so that gas flowing into the inflow space 40Bis inhibited from flowing out to the heat detection space 62B. Asillustrated in FIG. 8, the second partition wall 160B is provided toprotrude downward from the lower side portion of the inner cover 30B onthe outside of the inner cover 30B.

In addition, a specific configuration of the second partition wall 160Bis arbitrary. In Embodiment 2, the second partition wall 160B isconfigured to surround at least a part of a periphery of the insertionhole 120B, the insertion hole 140 aB, and the heat detection unit 110Bin the inflow space 40B. Specifically, as illustrated in FIG. 8, thesecond partition wall 160B is formed from a tubular body (for example, acylindrical body, a square tubular body, etc.), and is disposed suchthat the entire outer periphery of each of the insertion hole 120B, theinsertion hole 140 aB, and the heat detection unit 110B is covered bythe second partition wall 160B. In addition, since a vertical length ofthe second partition wall 160B is set to be substantially the same as avertical length of the inflow space 40B, and the second partition wall160B is disposed such that a lower end portion of the second partitionwall 160B comes into contact with the top surface portion 22B, gasflowing into the inflow space 40B is inhibited from flowing out to theheat detection space 62B through a gap between the lower end portion ofthe second partition wall 160B and the top surface portion 22B.

According to such a configuration, it is possible to inhibit gas flowinginto the inflow space 40B from flowing out to the heat detection space62B. Therefore, when compared to a case in which the second partitionwall 160B is not provided, it is possible to prevent detection of theheat detection unit 110B from being inhibited by gas that has flowed in,and to maintain or improve heat detection accuracy. In particular, sincethe second partition wall 160B is configured to surround the entireperiphery of each of the insertion hole 120B, the insertion hole 140 aB,and the heat detection unit 110B in the inflow space 40B, it is possibleto effectively inhibit gas flowing into the inflow space 40B fromflowing out to the heat detection space 62B through the insertion hole120B or the insertion hole 140 aB, and heat detection accuracy is easilymaintained. Here, the statement that “detection of the heat detectionunit 110B is inhibited by the gas that has flowed in” corresponds to,for example, a fact that when gas flowing in from the inflow space 40Bflows out from the heat detection space 62B (that is, when an air flowfrom the inflow space 40B side to the heat detection unit 110B isgenerated), an external atmosphere is disturbed by the air flow, and theheat detection space 62B and the heat detection unit 110B are notdirectly reached, a fact that when air permeability of the heatdetection space 62B is increased by gas flowing in from the inflow space40B, even if an external atmosphere containing heat flows into the heatdetection space 62B, the external atmosphere easily blows therethrough,and thus a time when the external atmosphere stays in the heat detectionspace 62B shortens, etc.

(Configuration—Details of Configuration of Inner Cover—OtherConfigurations)

In addition, a method of forming the first partition wall 150B and thesecond partition wall 160B is arbitrary. In Embodiment 2, the firstpartition wall 150B and the second partition wall 160B, and the innercover 30B are mutually integrally formed. For example, the portions maybe integrally formed by injection-molding a resin material having alight shielding property. In this way, when compared to a case in whichthe first partition wall 150B and the second partition wall 160B areseparately formed from the inner cover 30B, it is possible to save timeand effort to attach the first partition wall 150B and the secondpartition wall 160B to the inner cover 30B, and to improvemanufacturability of the fire detection apparatus 1B. In addition, it ispossible to reduce the number of parts of the fire detection apparatus1B, and to reduce an environmental load accompanying manufacture of thefire detection apparatus 1B. However, the invention is not limitedthereto. For example, the first partition wall 150B and the secondpartition wall 160B may be separately formed from the inner cover 30B,and the first partition wall 150B and the second partition wall 160B maybe connected to the inner cover 30B by a fixing tool, a fittingstructure, etc.

(With Regard to Action of Fire Detection Apparatus)

Next, a description will be given of an action of the fire detectionapparatus 1B configured as described above.

That is, for example, when gas present outside the fire detectionapparatus 1B flows into the carbon monoxide detection space 61B throughthe inflow space 40B and the inflow hole 30 bB in a state in which thefire detection apparatus 1B is attached to the installation surface 2B,the gas that has flowed in is inhibited from moving to a space otherthan the carbon monoxide detection space 61B in a space inside the innercover 30B by the first partition wall 150B. Therefore, it is possible toinhibit the gas that has flowed in from flowing out to the heatdetection space 62B.

In addition, for example, when gas present outside the fire detectionapparatus 1B flows into the inflow space 40B, the gas that has flowed inis inhibited from moving to the internal space of the second partitionwall 160B in the inflow space 40B by the second partition wall 160B.Therefore, it is possible to inhibit the gas that has flowed in fromflowing out to the heat detection space 62B.

Effect of Embodiment 2

As described above, according to Embodiment 2, since the inflow space40B, the carbon monoxide detection space 61B, and the smoke detectionspace 63B for performing detection of the first detection targetcontained in gas flowing in from the outside of the housing in thehousing, the heat detection space 62B located outside the housing toperform detection of the second detection target, and the firstpartition wall 150B and the second partition wall 160B provided in thehousing to partition the inflow space 40B, the carbon monoxide detectionspace 61B, or the heat detection space 62B so that gas flowing into theinflow space 40B or the carbon monoxide detection space 61B can beinhibited from flowing out to the heat detection space 62B are included,it is possible to inhibit gas flowing into the inflow space 40B or thecarbon monoxide detection space 61B from flowing out to the heatdetection space 62B. Therefore, when compared to a case in which thefirst partition wall 150B and the second partition wall 160B are notprovided, it is possible to prevent detection of the second detectiontarget by the heat detection unit 110B from being inhibited by the gasthat has flowed in, and it is possible to maintain or improve detectionaccuracy of the second detection target.

In addition, since the insertion hole 120B and the insertion hole 140 aBprovided in a portion facing the inflow space 40B in a portion of thehousing to insert a part of the heat detection unit 110B into the heatdetection space 62B are included, and the second partition wall 160B isconfigured to surround at least the part of the periphery of theinsertion hole 120B, the insertion hole 140 aB, and the heat detectionunit 110B in the inflow space 40B, it is possible to effectively inhibitgas flowing into the inflow space 40B from flowing out to the heatdetection space 62B through the insertion hole 120B and the insertionhole 140 aB, and detection accuracy of the second detection target iseasily maintained.

In addition, since the inflow hole 30 bB provided in the housing and thecarbon monoxide detection unit for detecting the first detection targetare included, and the partition wall 150B is configured to surround atleast the part of the periphery of the carbon monoxide detection unitand the inflow hole 30 bB in the carbon monoxide detection space 61B, itis possible to effectively inhibit gas flowing into the carbon monoxidedetection space 61B from flowing out to the heat detection space 62Bthrough the inflow hole 30 bB, and detection accuracy of the seconddetection target is easily maintained.

In addition, since the inner cover 30B, and the first partition wall150B and the second partition wall 160B are mutually integrally formed,when compared to a case in which the inner cover 30B is separatelyformed from the first partition wall 150B and the second partition wall160B, it is possible to save time and effort to attach the firstpartition wall 150B and the second partition wall 160B to the innercover 30B, and to improve manufacturability of the fire detectionapparatus 1B. In addition, it is possible to reduce the number of partsof the fire detection apparatus 1B, and to reduce an environmental loadaccompanying manufacture of the fire detection apparatus 1B.

In addition, since the first detection target is smoke or carbonmonoxide, and the second detection target is heat, it is possible toinhibit gas containing smoke or carbon monoxide from flowing out to theheat detection space 62B, and it is possible to maintain or improve heatdetection accuracy.

Embodiment 3

Next, a fire detection apparatus according to Embodiment 3 will bedescribed. Embodiment 3 corresponds to a mode of including a cover unitdescribed below for covering at least a part of a periphery of adetection unit described below.

(Configuration)

First, a description will be given of a configuration of the firedetection apparatus according to Embodiment 3. FIG. 9 is a side viewillustrating an attachment state of the fire detection apparatusaccording to Embodiment 3. FIG. 10 is a diagram illustrating the firedetection apparatus in a state of removing an attachment base describedbelow, in which FIG. 10(a) is a plan view and FIG. 10(b) is a bottomview. FIG. 11 is a cross-sectional view taken along A-A line of FIG.10(b). FIG. 12 is a cross-sectional view taken along B-B line of FIG.10(b). In the following description, an X direction of FIG. 9 isreferred to as a left-right direction of the fire detection apparatus (a+X direction is a left direction of the fire detection apparatus and a−X direction is a right direction of the fire detection apparatus), a Ydirection of FIG. 10 is referred to as a front-back direction of thefire detection apparatus (a +Y direction is a frontward direction of thefire detection apparatus and a −Y direction is a backward direction ofthe fire detection apparatus), and a Z direction of FIG. 9 is referredto as a vertical direction of the fire detection apparatus (a +Zdirection is an upward direction of the fire detection apparatus and a−Z direction is a downward direction of the fire detection apparatus).

The fire detection apparatus 1C is installed on an installation surface2C on a lower surface of a ceiling portion of a building in an interiorof the building as illustrated in FIG. 9, and includes an attachmentbase 10C, an outer cover 20C, an inner cover 30C, an inflow space 40C,an insect screen 50C, a first detection space 61C, a second detectionspace 62C, a detector cover 70C, a detector body 80C, a terminal board90C, and a substrate 100C as illustrated in FIG. 9 to FIG. 12.

(Configuration—Attachment Base)

Returning to FIG. 9, the attachment base 10C is an attaching unit thatattaches the outer cover 20C to the installation surface 2C. Theattachment base 10C is configured using, for example, a known attachmentbase for the fire detection apparatus (as an example, a substantiallyplate-shaped attachment base made of resin), etc., and is fixed to theinstallation surface 2C by a fixing tool, etc. as illustrated in FIG. 9.

(Configuration—Outer Cover)

The outer cover 20C is a cover that covers the inner cover 30C, theinflow space 40C, the insect screen 50C, the first detection space 61C,the detector cover 70C, the detector body 80C, the terminal board 90C,and the substrate 100C. The outer cover 20C is formed of, for example, aresin material having a light shielding property, and includes an outercover body 21C, a top surface portion 22C, a first rib portion 23C, anda second rib portion 24C as illustrated in FIG. 9 to FIG. 11.

Among these portions, the outer cover body 21C is a basic structure ofthe outer cover 20C. The outer cover body 21C is formed of, for example,a substantially hollow cylindrical body whose upper surface and lowersurface are open, is disposed so that an upper end portion of the outercover body 21C comes into contact with a lower surface of the attachmentbase 10C as illustrated in FIG. 9, and is fixed to the attachment base10C by a fitting structure (or a fixing tool), etc.

In addition, the top surface portion 22C is a partition unit thatpartitions the inflow space 40C. The top surface portion 22C is formedof, for example, a substantially circular plate-shaped body, is providedsubstantially horizontally below the outer cover body 21C as illustratedin FIG. 9 to FIG. 11, and is provided to face the second detection space62C. The top surface portion 22C corresponds to a “facing side portion”in the claims.

In addition, the first rib portion 23C is a partition unit thatpartitions the inflow space 40C. The first rib portion 23C is formedfrom a substantially plate-shaped body, and is provided verticallybetween the outer cover body 21C and the top surface portion 22C.Specifically, as illustrated in FIG. 9 and FIG. 11, a plurality of firstrib portions 23C is provided radially from the vicinity of a center ofthe outer cover 20C, and is connected to the outer cover body 21C andthe top surface portion 22C.

In addition, the second rib portion 24C is a partition unit thatpartitions the inflow space 40C. The second rib portion 24C is formedfrom a substantially plate-shaped body, and is provided verticallybetween the outer cover body 21C and the top surface portion 22C.Specifically, as illustrated in FIG. 9 and FIG. 11, a plurality ofsecond rib portions 24C is provided between inner end portions ofadjacent first rib portions 23C, and is connected to the outer coverbody 21C and the top surface portion 22C. Details of a configuration ofthe outer cover 20C will be described below.

(Configuration—Inflow Space)

Returning to FIG. 9, the inflow space 40C is a space for allowing gascontaining a first detection target (specifically smoke) to flow fromthe outside of the fire detection apparatus 1C into the fire detectionapparatus 1C. A plurality of inflow spaces 40C is formed inside theouter cover 20C. Specifically, as illustrated in FIG. 9 and FIG. 11, aspace surrounded by the top surface portion 22C, the first rib portion23C, the second rib portion 24C, and the inner cover 30C in an internalspace of the outer cover 20C is formed as the inflow space 40C.

(Configuration—Inner Cover)

The inner cover 30C is a cover that covers the first detection space61C, the detector cover 70C, the detector body 80C, and the substrate100C, and is a partition unit that partitions the inflow space 40C. Theinner cover 30C is, for example, a substantially hollow cylindrical bodywhose upper surface is open, is formed of a resin material having alight shielding property, and is provided so that a lower side portionof the inner cover 30C faces the top surface portion 22C of the outercover 20C through the inflow space 40C on the inside of the outer cover20C as illustrated in FIG. 11.

In addition, as illustrated in FIG. 11, a first opening 30 aC isprovided in the lower side surface of the inner cover 30C. The firstopening 30 aC is an opening for sending gas flowing into the inflowspace 40C to the first detection space 61C, and is provided at asubstantially central portion and the vicinity thereof in the lower sidesurface of the inner cover 30C as illustrated in FIG. 11. Details of theconfiguration of the inner cover 30C will be described below. Inaddition, a portion including the “outer cover 20C” and the “inner cover30C” described above corresponds to a “housing” in the claims.

(Configuration—First Detection Space)

The first detection space 61C is a space for detecting the firstdetection target. As illustrated in FIG. 11, a space surrounded by thedetector cover 70C and the detector body 80C in a space located insidethe inner cover 30C is formed as the first detection space 61C.

(Configuration—Second Detection Space)

The second detection space 62C is a space for detecting a seconddetection target (specifically heat). As illustrated in FIG. 11, a spacelocated near a insertion hole 120C described below in a space locatedoutside the outer cover 20C is formed as the second detection space 62C.

(Configuration—Detector Cover)

The detector cover 70C is a partition unit that partitions the firstdetection space 61C, and is an incidence suppression unit thatsuppresses incidence of ambient light into the first detection space61C. The detector cover 70C is a substantially hollow cylindrical bodywhose upper surface is open, and is formed of a resin material having alight shielding property. In addition, as illustrated in FIG. 11, thedetector cover 70C is disposed so that a lower side surface of thedetector cover 70C faces the top surface portion 22C of the outer cover20C through the first opening 30 aC and the inflow space 40C on theinside of the inner cover 30C, and is fixed to the detector body 80C bya fitting structure, etc. In addition, as illustrated in FIG. 11, asecond opening 70 aC is formed in the lower side surface of the detectorcover 70C. The second opening 70 aC is an opening for allowing gas sentfrom the first opening 30 aC to flow into the first detection space 61C,and is provided at a portion corresponding to the first opening 30 aC onthe lower side surface of the detector cover 70C as illustrated in FIG.11.

(Configuration—Insect Screen)

The insect screen 50C is a net for preventing insects present outsidethe fire detection apparatus 1C from intruding into the first detectionspace 61C. The insect screen 50C is configured using a mesh-like andcircular net, and is attached to the detector cover 70C as illustratedin FIG. 11.

(Configuration—Detector Body)

The detector body 80C is an attaching unit that attaches the detectorcover 70C, and is an incidence suppression unit that suppressesincidence of ambient light into the first detection space 61C. Thedetector body 80C is formed of, for example, a resin material having alight shielding property, is disposed to cover an upper surface of thedetector cover 70C as illustrated in FIG. 11, and is fixed to thesubstrate 100C by a fixing tool, etc. In addition, the detector body 80Cis provided with a support (not illustrated) for supporting each of afirst light emitting unit (described below), a second light emittingunit (described below), and a light receiving unit (described below).Furthermore, each optical path hole (not illustrated) for forming anoptical path between the first detection space 61C and each of the firstlight emitting unit (described below), the second light emitting unit(described below), and the light receiving unit (described below) isformed in the detector body 80C.

(Configuration—Terminal Board)

The terminal board 90C is an accommodation unit that accommodates theinner cover 30C, the detector cover 70C, the detector body 80C, and thesubstrate 100C. The terminal board 90C has a substantially hollowcylindrical shape whose lower surface is open, and is formed of, forexample, a resin material having a light shielding property. Inaddition, as illustrated in FIG. 11, the terminal board 90C is providedto cover the inner cover 30C, the detector cover 70C, the detector body80C, and the substrate 100C from above, is fixed to the outer cover 20Cby a fitting structure, etc., and is fixed to the attachment base 10C bya fixing tool, etc. through a first attachment hole 91 aC formed in anattachment member 91C.

(Configuration—Substrate)

The substrate 100C is a mounting unit on which various electric circuits(not illustrated) are mounted. The substrate 100C is configured using,for example, a known flat plate-shaped circuit board, etc., is disposedsubstantially horizontally at a distance from an upper end portion and alower end portion of the terminal board 90C in the terminal board 90C asillustrated in FIG. 11, and is fixed to the terminal board 90C by afixing tool through an attachment hole (not illustrated) formed in theterminal board 90C and a second attachment hole 91 bC formed in theattachment member 91C.

Further, in addition to the fact that a known electronic component usedfor the conventional fire detection apparatus 1C is mounted on thesubstrate 100C, as illustrated in FIG. 11 and FIG. 12, the first lightemitting unit (not illustrated), the second light emitting unit (notillustrated), the light receiving unit (not illustrated), a heatdetection unit 110C, a display unit (not illustrated), a communicationunit (not illustrated), a power supply unit (not illustrated), a controlunit (not illustrated), and a storage unit (not illustrated) are mountedon the substrate 100C.

(Configuration—Substrate—First Light Emitting Unit, Second LightEmitting Unit, and Light Receiving Unit)

Among these units, the first light emitting unit is a first lightemitting unit that irradiates the first detection space 61C withdetection light (hereinafter referred to as “first detection light”),and is configured using, for example, a known light emitting element (asan example, an infrared LED, etc.). In addition, the second lightemitting unit is a second light emitting unit that irradiates the firstdetection space 61C with detection light (hereinafter referred to as“second detection light”) having a different wavelength from that of thefirst detection light, and is configured using, for example, a knownlight emitting element (as an example, a blue LED, etc.). In addition,the light receiving unit is a light receiving unit that receivesscattered light of the first detection light irradiated from the firstlight emitting unit due to smoke, outputs a first light receiving signalaccording to the received scattered light, receives scattered light ofthe second detection light irradiated from the second light emittingunit with respect to smoke, and outputs a second light receiving signalaccording to the received scattered light, and is configured using, forexample, a known light receiving element (as an example, a photodiode,etc.). In addition, a method of installing the first light emittingunit, the second light emitting unit, and the light receiving unit isarbitrary. In Embodiment 3, installation is performed to be able toavoid direct reception of the first detection light or the seconddetection light irradiated from the first light emitting unit or thesecond light emitting unit to the light receiving unit through variousoptical path holes of the detector body 80C. For example, the firstlight emitting unit and the light receiving unit are installed at aposition at which an angle between an optical axis of the first lightemitting unit (hereinafter referred to as a “first light emitting-sideoptical axis”) and an optical axis of the light receiving unit(hereinafter referred to as a “light receiving-side optical axis”) isabout 135°. In addition, the second light emitting unit and the lightreceiving unit are installed at a position at which an angle between anoptical axis of the second light emitting unit (hereinafter referred toas a “second light emitting-side optical axis”) and the lightreceiving-side optical axis is about 90°.

(Configuration—Substrate—Heat Detection Unit)

In addition, the heat detection unit 110C is a detection unit thatdetects the second detection target. The heat detection unit 110C isconfigured using, for example, a known heat detection element (as anexample, a thermistor, etc.), and is disposed so that a part of the heatdetection unit 110C is inserted into (accommodated in) the seconddetection space 62C through an insertion hole (not illustrated) providedin the detector body 80C, an insertion hole 161C of the detector cover70C described below, an insertion hole 141C of the inner cover 30Cdescribed below, and the insertion hole 120C of the outer cover 20Cdescribed below as illustrated in FIG. 12.

(Configuration—Substrate—Display Unit, Communication Unit, and PowerSupply Unit)

In addition, the display unit is a display unit that displayspredetermined information (for example, information indicating thepresence or absence of detection of a fire) by irradiating light(hereinafter referred to as “display light”) to the outside of the firedetection apparatus 1C, and is configured using, for example, a knowndisplay unit (an LED, etc.). In addition, a light projection method ofthe display unit is arbitrary. Examples thereof include light projectionby guiding display light from the display unit toward the outside of thefire detection apparatus 1C through an insertion hole (not illustrated)provided in the detector body 80C, an insertion hole 162C of thedetector cover 70C described below, an insertion hole 142C of the innercover 30C described below, and a light guide (not illustrated) insertedinto the insertion hole 120C of the outer cover 20C described below. Inaddition, the communication unit is a communication unit thatcommunicates with an external apparatus (for example, a receiver, etc.).In addition, the power supply unit is a power supply unit that suppliespower supplied from a commercial power supply or a battery (notillustrated) to each unit of the fire detection apparatus 1C.

(Configuration—Substrate—Control Unit and Storage Unit)

In addition, the control unit is a control unit that controls the firedetection apparatus 1C. Specifically, the control unit is a computerincluding a CPU and an internal memory such as a RAM for storing variousprograms (including a basic control program such as the OS and anapplication program activated on the OS to realize a specific function)to be interpreted and executed on the CPU, a program, and various data.In addition, the storage unit is a storage unit that stores programs andvarious data necessary for an operation of the fire detection apparatus1C. The storage unit is configured using a rewritable recording medium.For example, it is possible to use a non-volatile recording medium suchas a flash memory.

(Configuration—Details of Configuration of Outer Cover)

Returning to FIG. 9, next, a description will be given of details of aconfiguration of the outer cover 20C. However, the outer cover 20C maybe manufactured in an arbitrary shape using an arbitrary method andmaterial, unless otherwise specified.

In Embodiment 3, as illustrated in FIG. 9 to FIG. 12, the insertion hole120C and a guard portion 130C are provided in the top surface portion22C of the outer cover 20C.

(Configuration—Details of Configuration of Outer Cover—Insertion Hole)

The insertion hole 120C is a through-hole for inserting a part of theheat detection unit 110C into the second detection space 62C andirradiating display light from the display unit to the outside of thefire detection apparatus 1C.

Here, a specific shape and size of the insertion hole 120C arearbitrary. In Embodiment 3, as illustrated in FIG. 10(b), a planar shapeof the insertion hole 120C is set to a substantially elliptical shape(or may be a polygonal shape such as a quadrangular shape). In addition,a diameter of the insertion hole 120C is set to a size that allows onlya part of the heat detection unit 110C to be exposed to the seconddetection space 62C and allows display light to be irradiated to theoutside of the fire detection apparatus 1C. For example, the diameter isset to be longer than a length obtained by adding a diameter of the heatdetection unit 110C to a diameter of the light guide.

In addition, a method of forming the insertion hole 120C is arbitrary.The insertion hole 120C is formed in a portion facing the inflow space40C. Specifically, as illustrated in FIG. 10(b), the insertion hole 120Cis formed in a right side portion on the top surface portion 22C. Inthis case, for example, the heat detection unit 110C and the displayunit may be installed in a portion corresponding to the insertion hole120C or the vicinity thereof in a portion of the substrate 100C.According to such a formation method, when compared to a case in whichthe insertion hole 120C is formed in the central portion of the topsurface portion 22C, there are few restrictions on attachment of theheat detection unit 110C and the display unit. Therefore, it is possibleto maintain an attachment property of the heat detection unit 110C andthe display unit.

According to such an insertion hole 120C, a part of the heat detectionunit 110C may be inserted into the second detection space 62C throughthe insertion hole 120C, and display light from the display unit may beirradiated to the outside of the fire detection apparatus 1C through theinsertion hole 120C.

(Configuration—Details of Configuration of Outer Cover—Guard Portion)

The guard portion 130C is a guard unit that protects the heat detectionunit. As illustrated in FIG. 9 to FIG. 12, the guard portion 130C isprovided to cover a periphery of the insertion hole 120C and a portionof the heat detection unit 110C exposed to the outside of the firedetection apparatus 1C. In addition, the guard portion 130C isconfigured by combining a plurality of long ribs 131C (hereinafterreferred to as “guard side ribs 131C”). Specifically, as illustrated inFIG. 9 to FIG. 12, the guard portion 130C is provided such that alongitudinal direction of each of the plurality of guard side ribs 131Cextends substantially along the vertical direction (is slightly inclinedin FIG. 10(b) and FIG. 11), and is vertically arranged with respect to alower surface of the top surface portion 22C with an intervaltherebetween.

According to such a configuration, it is possible to inhibit theinsertion hole 120C from being exposed to the outside of the firedetection apparatus 1C by the guard portion 130C, and it is possible tomaintain the design property of the fire detection apparatus 1C withoutimpairing the inflow property of gas to the guard portion 130C.

(Configuration—Details of Configuration of Inner Cover)

Returning to FIG. 11, next, a description will be given of details ofthe configuration of the inner cover 30C. FIG. 13 is a perspective viewillustrating the inner cover 30C. However, the inner cover 30C may bemanufactured in an arbitrary shape using an arbitrary method andmaterial, unless otherwise specified.

In Embodiment 3, as illustrated in FIG. 11 to FIG. 13, the insertionhole 141C, the insertion hole 142C, and a first cover portion 150C areprovided in the inner cover 30C.

(Configuration—Details of Configuration of Inner Cover—Insertion Hole)

The insertion hole 141C is a through-hole for inserting a part of theheat detection unit 110C into the second detection space 62C, and theinsertion hole 142C is a through-hole for irradiating display light fromthe display unit to the outside of the fire detection apparatus 1C. Asillustrated in FIG. 12 and FIG. 13, the insertion holes 141C and 142Care provided in portions of the lower side portion of the inner cover30C facing the inflow space 40C and corresponding to the insertion hole120C, respectively.

(Configuration—Details of Configuration of Inner Cover—First CoverPortion)

The first cover portion 150C is a cover unit that covers at least a partof a periphery of the heat detection unit 110C so that gas flowing intothe inflow space 40C can be inhibited from coming into contact with theheat detection unit 110C. As illustrated in FIG. 12 and FIG. 13, thefirst cover portion 150C is provided to protrude downward from the lowerside portion of the inner cover 30C on the outside of the inner cover30C.

In addition, a specific configuration of the first cover portion 150C isarbitrary. In Embodiment 3, the first cover portion 150C is configuredto surround at least a part of a periphery of a portion of the heatdetection unit 110C located in the inflow space 40C (hereinafterreferred to as a “first portion”).

Specifically, first, as illustrated in FIG. 12 and FIG. 13, the firstcover portion 150C is formed from a tubular body (for example, acylindrical body, a square tubular body, etc.) into which the heatdetection unit 110C can be inserted, and is disposed such that theentire outer periphery of each of the insertion hole 120C, the insertionhole 141C, and the first portion of the heat detection unit 110C iscovered by the first cover portion 150C. In this case, an inner diameterof the first cover portion 150C is arbitrary. For example, gas flowinginto the inflow space 40C may be inhibited from coming into contact withthe heat detection unit 110C by setting an inner diameter of at least apart of the first cover portion 150C to be substantially the same as anouter diameter of a portion of the heat detection unit 110C insertedinto the first cover portion 150C (specifically, an outer diameter of across section of the first portion along an X-Y plane) (an innerdiameter of a second cover portion 170C described below may be similarlyset). In this way, it is possible to simply configure the first coverportion 150C, and to improve manufacturability of the first coverportion 150C.

In addition, the first cover portion 150C and the insertion hole 120Care configured such that an end portion of the first cover portion 150Con the second detection space 62C side (a lower end portion of the firstcover portion 150C in FIG. 12) is fit to the top surface portion 22Cthrough the insertion hole 120C. More specifically, as illustrated inFIG. 12, a vertical length of the first cover portion 150C is set to besubstantially the same as a vertical length of the inflow space 40C. Inaddition, a fitting portion (not illustrated) is provided in any one ofthe lower end portion of the first cover portion 150C or a portion ofthe top surface portion 22C near the insertion hole 120C, a fit portion(not illustrated) is provided in the other one of the lower end portionof the first cover portion 150C or the portion of the top surfaceportion 22C near the insertion hole 120C, and the first cover portion150C is disposed such that the fit portion is fit by the fittingportion. In this way, it is possible to inhibit gas flowing into theinflow space 40C from flowing in from an end portion on the seconddetection space 62C side, and it becomes easy to inhibit gas flowinginto the inflow space 40C from coming into contact with the heatdetection unit 110C. In addition, at the time of assembly of the firedetection apparatus 1C, positioning of the first cover portion 150C isfacilitated, and thus it is possible to rapidly and accurately performassembly work.

According to such a configuration of the first cover portion 150C, it ispossible to inhibit gas flowing into the inflow space 40C from cominginto contact with the heat detection unit 110C, and it is possible tomaintain or improve detection accuracy of the second detection target.In particular, since the first detection target is smoke, and the seconddetection target is heat, it is possible to inhibit gas containing smokefrom coming into contact with the heat detection unit 110C, and it ispossible to maintain or improve heat detection accuracy.

(Configuration—Details of Configuration of Detector Cover)

Returning to FIG. 2, next, a description will be given of details of theconfiguration of the detector cover 70C. FIG. 14 is a perspective viewillustrating the detector cover 70C. However, the detector cover 70C maybe manufactured in an arbitrary shape using an arbitrary method andmaterial, unless otherwise specified.

In Embodiment 3, as illustrated in FIG. 12 and FIG. 14, the insertionhole 161C, the insertion hole 162C, and the second cover portion 170Care provided in the detector cover 70C.

(Configuration—Details of Configuration of Detector Cover—InsertionHole)

The insertion hole 161C is a through-hole for inserting a part of theheat detection unit 110C into the second detection space 62C, and isprovided in a portion corresponding to the insertion hole 141C in alower side portion of the detector cover 70C as illustrated in FIG. 12and FIG. 14. In addition, the insertion hole 162C is a through-hole forirradiating display light from the display unit to the outside of thefire detection apparatus 1C, and is provided in a portion correspondingto the insertion hole 142C in the lower side portion of the detectorcover 70C as illustrated in FIG. 14.

(Configuration—Details of Configuration of Detector Cover—Second CoverPortion)

The second cover portion 170C is a cover unit that covers at least apart of a periphery of the heat detection unit 110C so that gas flowinginto the inflow space 40C can be inhibited from coming into contact withthe heat detection unit 110C. As illustrated in FIG. 12 and FIG. 14, thesecond cover portion 170C is provided to protrude downward from thelower side portion of the second cover portion 170C on the outside ofthe second cover portion 170C.

In addition, a specific configuration of the second cover portion 170Cis arbitrary. In Embodiment 3, the second cover portion 170C isconfigured to surround at least a part of a periphery of a portion ofthe heat detection unit 110C located inside the inner cover 30C(specifically, a portion other than the first detection space 61C on theinside of the inner cover 30C) (hereinafter referred to as a “secondportion”).

Specifically, first, as illustrated in FIG. 12 and FIG. 14, the secondcover portion 170C is formed from a tubular body (for example, acylindrical body, a square tubular body, etc.) into which the heatdetection unit 110C can be inserted, and is disposed such that theentire outer periphery of each of the insertion hole 141C, the insertionhole 161C, and the second portion of the heat detection unit 110C iscovered by the second cover portion 170C. In this case, an innerdiameter of the second cover portion 170C is arbitrary. For example, asillustrated in FIG. 12, by setting an inner diameter on a proximal endside of the heat detection unit 110C in inner diameters of the secondcover portion 170C (in FIG. 12, an inner diameter on an upper side ofthe second cover portion 170C) to be larger than the other innerdiameter, it is possible to increase insertability of the heat detectionunit 110C into the second cover portion 170C, and a size reduction ofthe second cover portion 170C may be facilitated. In this way, it ispossible to simply configure the second cover portion 170C, and toimprove manufacturability of the second cover portion 170C.

In addition, the second cover portion 170C is configured to be able tobe fit to the first cover portion 150C. More specifically, asillustrated in FIG. 12 and FIG. 14, the vertical length of the secondcover portion 170C is set to be slightly shorter than (or substantiallythe same as) a vertical length of the inner cover 30C. In addition, afitting portion (not illustrated) is provided in any one of an upper endportion of the first cover portion 150C or a lower end portion of thesecond cover portion 170C, a fit portion (not illustrated) is providedin the other one of the upper end portion of the first cover portion150C or the lower end portion of the second cover portion 170C, and thesecond cover portion 170C is disposed such that the fit portion is fitby the fitting portion. In this way, it is possible to inhibit gasflowing into the inflow space 40C from flowing into a boundary betweenthe first cover portion 150C and the second cover portion 170C, and itbecomes easy to inhibit gas flowing into the inflow space 40C fromcoming into contact with the heat detection unit 110C. In addition, atthe time of assembly of the fire detection apparatus 1C, positioning ofthe second cover portion 170C is facilitated, and thus it is possible torapidly and accurately perform assembly work.

According to such a configuration of the second cover portion 170C, itis possible to inhibit gas flowing into the inflow space 40C from cominginto contact with the heat detection unit 110C, and it is possible tomaintain or improve detection accuracy of the second detection target.

A method of forming the first cover portion 150C and the second coverportion 170C is arbitrary. In Embodiment 3, as illustrated in FIG. 12 toFIG. 14, the first cover portion 150C and the second cover portion 170Care separately formed. However, the invention is not limited thereto.For example, the first cover portion 150C, the second cover portion170C, and the detector cover 70C (or the inner cover 30C) may beintegrally formed by injection-molding of a resin material having alight shielding property.

(With Regard to Action of Fire Detection Apparatus)

Next, a description will be given of an action of the fire detectionapparatus 1C configured as described above.

That is, for example, when gas present outside the fire detectionapparatus 1C flows into the inflow space 40C in a state in which thefire detection apparatus 1C is attached to the installation surface 2C,the gas that has flowed in is inhibited from coming into contact withthe heat detection unit 110C (specifically, the first portion) by thefirst cover portion 150C. Therefore, it is possible to inhibit gasflowing into the inflow space 40C from coming into contact with the heatdetection unit 110C.

In addition, when gas present outside the fire detection apparatus 1Cflows into the inner cover 30C through the first opening 30 aC afterflowing into the inflow space 40C, the gas that has flowed in isinhibited from coming into contact with the heat detection unit 110C(specifically, the second portion) by the second cover portion 170C.Therefore, it is possible to inhibit gas flowing into the inflow space40C from coming into contact with the heat detection unit 110C.

Effect of Embodiment 3

As described above, according to Embodiment 3, since the first detectionspace 61C located inside the housing, the second detection space 62Clocated outside the housing, the inflow space 40C located inside thehousing to allow gas containing the first detection target to flow intothe first detection space 61C from the outside the housing, the heatdetection unit 110C for detecting the second detection target providedsuch that at least a part of the heat detection unit 110C isaccommodated in the second detection space 62C, and the first coverportion 150C and the second cover portion 170C for covering at least apart of the periphery of the heat detection unit 110C so that gasflowing into the inflow space 40C can be inhibited from coming intocontact with the heat detection unit 110C are included, it is possibleto inhibit gas flowing into the inflow space 40C from coming intocontact with the heat detection unit 110C, and it is possible tomaintain or improve detection accuracy of the second detection target.

In addition, since each of the first cover portion 150C and the secondcover portion 170C is formed from a tubular body into which the heatdetection unit 110C can be inserted, it is possible to simply configurethe first cover portion 150C and the second cover portion 170C, and itis possible to improve manufacturability of the first cover portion 150Cand the second cover portion 170C.

In addition, since the inner diameter on the proximal end side of theheat detection unit 110C in inner diameters of the second cover portion170C is set to be larger than the other inner diameter, it is possibleto increase insertability of the heat detection unit 110C into thesecond cover portion 170C, and a size reduction of the second coverportion 170C is facilitated.

In addition, since the inner diameter of at least the part of the firstcover portion 150C is set to be substantially the same as the outerdiameter of the portion of the heat detection unit 110C inserted intothe first cover portion 150C (specifically, the outer diameter of thecross section of the first portion along the X-Y plane), it becomes easyto inhibit gas flowing into the inflow space 40C from coming intocontact with the heat detection unit 110C, and it becomes easy tomaintain detection accuracy of the second detection target.

In addition, since the insertion hole 120C for inserting the heatdetection unit 110C into the second detection space 62C is provided inthe top surface portion 22C facing the second detection space 62C in theside portion of the housing, and the insertion hole 120C and the firstcover portion 150C are configured such that the end portion of the firstcover portion 150C on the second detection space 62C side can be fit tothe top surface portion 22C through the insertion hole 120C, it ispossible to inhibit gas flowing into the inflow space 40C from flowingin from the end portion on the second detection space 62C side, and itbecomes more easy to inhibit gas flowing into the inflow space 40C fromcoming into contact with the heat detection unit 110C. In addition, atthe time of assembly of the fire detection apparatus 1C, positioning ofthe first cover portion 150C is facilitated, and thus it is possible torapidly and accurately perform assembly work.

In addition, since the first detection target is smoke and the seconddetection target is heat, contact of gas containing smoke with the heatsensing unit 110C can be suppressed, and heat detection accuracy can bemaintained or improved.

[III] MODIFICATIONS TO EMBODIMENTS

Even though Embodiment 1 to Embodiment 3 according to the invention havebeen described above, a specific configuration and means of theinvention can be arbitrarily modified and improved within a range of atechnical idea of each invention described in the claims. Hereinafter,such a modification will be described.

Modifications to Embodiment 1

First, modifications of Embodiment 1 will be described.

(With Regard to Problem to be Solved and Effect of Invention)

First, a problem to be solved by the invention and effect of inventionare not limited to the above contents, and may differ in accordance withdetails of an implementation environment or a configuration of theinvention. Only some of the above-mentioned problems may be solved, oronly some of the above-mentioned effects may be achieved in some cases.

(With Regard to Fire Detection Apparatus)

Embodiment 1 describes that the fire detection apparatus 1A includes theinner cover 30A. However, the invention is not limited thereto. Forexample, the inner cover 30A may be omitted.

(With Regard to Insertion Hole)

Embodiment 1 describes that the insertion hole 120A is formed in aportion other than the central portion in the part of the top surfaceportion 22A. However, the invention is not limited thereto. For example,the insertion hole 120A may be formed in the central portion of the topsurface portion 22A.

(With Regard to Guard Portion)

Embodiment 1 describes that the number of installed ribs of the guardportion 130A is four. However, the invention is not limited thereto. Forexample, the number may be only two or only three, or may be five ormore.

In addition, Embodiment 1 describes that a material of some ribs among aplurality of ribs is made different from a material of some other ribs,and a shape of some ribs among the plurality of ribs is made differentfrom a shape of some other ribs. However, the invention is not limitedthereto. For example, a material of some ribs among the plurality ofribs may be made different from a material of some other ribs, andrespective shapes of the plurality of ribs may be the same.Alternatively, respective materials of the plurality of ribs may be thesame, and a shape of some ribs among the plurality of ribs may be madedifferent from a shape of some other ribs.

In addition, Embodiment 1 describes that only the first guard side rib131A is formed of the translucent material. However, the invention isnot limited thereto. For example, a rib other than the first guard siderib 131A may be formed of the translucent material. As an example, atleast one of the second guard side rib 132A, the third guard side rib133A, or the fourth guard side rib 134A may be formed of the translucentmaterial. Alternatively, only two or only three of the first guard siderib 131A, the second guard side rib 132A, the third guard side rib 133A,or the fourth guard side rib 134A may be formed of the translucentmaterial.

In addition, Embodiment 1 describes that the thicknesses of the firstguard side rib 131A, the second guard side rib 132A, the third guardside rib 133A, and the fourth guard side rib 134A are set on the basisof the inflow or the inflow direction of the air flow flowing into theguard portion 130A. However, the invention is not limited thereto. Forexample, the thicknesses may be set on the basis of a parameter otherthan the inflow and the inflow direction of the air flow (for example, alength of a rib installation interval).

Embodiment 1 describes that the first guard side rib 131A is thethickest rib. However, the invention is not limited thereto. Forexample, the first guard side rib 131A may be a rib thinner than thethickest rib.

In addition, Embodiment 1 describes that the second guard side rib 132Ais the thinnest rib and the narrowest rib. However, the invention is notlimited thereto. For example, the second guard side rib 132A may beeither the thinnest rib or the narrowest rib. Alternatively, the secondguard side rib 132A may be a rib thicker than the thinnest rib and widerthan the narrowest rib.

Modifications to Embodiment 2

Next, modifications of Embodiment 2 will be described.

(With Regard to Problem to be Solved and Effect of Invention)

First, a problem to be solved by the invention and effect of inventionare not limited to the above contents, and may differ in accordance withdetails of an implementation environment or a configuration of theinvention. Only some of the above-mentioned problems may be solved, oronly some of the above-mentioned effects may be achieved in some cases.

(With Regard to Fire Detection Apparatus)

Embodiment 2 describes that the fire detection apparatus 1B includes theinner cover 30B. However, the invention is not limited thereto. Forexample, the inner cover 30B may be omitted. In this case, the firstpartition wall 150B and the second partition wall 160B may be providedinside the outer cover 20B.

In addition, Embodiment 2 describes that the fire detection apparatus 1Bincludes the carbon monoxide detection unit. However, the invention isnot limited thereto. For example, the carbon monoxide detection unit maybe omitted. In this case, the first partition wall 150B may be omitted.

(With Regard to Heat Detection Space)

Embodiment 2 describes that the heat detection space 62B is locatedoutside the outer cover 20B. However, the invention is not limitedthereto. For example, the heat detection space 62B may be located insidethe outer cover 20B. As an example, the heat detection space 62B may belocated between the top surface portion 22B of the outer cover 20B andthe inner cover 30B.

In addition, Embodiment 2 describes that the carbon monoxide detectionunit is provided at a position close to the inflow hole 30 bB. However,the invention is not limited thereto. For example, the carbon monoxidedetection unit may be provided at a position separated from the inflowhole 30 bB. As an example, the carbon monoxide detection unit may beprovided at a position close to the insertion hole 120B.

(With Regard to Inner Cover)

Embodiment 2 describes that one inflow hole 30 bB is provided in thelower side portion of the inner cover 30B. However, the invention is notlimited thereto. For example, a plurality of inflow holes 30 bB may beprovided at a portion facing the carbon monoxide detection space 61B inthe lower side portion of the inner cover 30B.

(With Regard to Partition Wall)

Embodiment 2 describes that the first partition wall 150B is configuredto surround only the part of the periphery of the carbon monoxidedetection unit and the inflow hole 30 bB in the carbon monoxidedetection space 61B. However, the invention is not limited thereto. Forexample, the first partition wall 150B may be configured to surround theentire periphery of the carbon monoxide detection unit and the inflowhole 30 bB.

In addition, Embodiment 2 describes that the entire periphery of theheat detection unit 110B, the insertion hole 120B, and the insertionhole 140 aB in the inflow space 40B is surrounded. However, theinvention is not limited thereto. For example, only a part of theperiphery of the heat detection unit 110B, the insertion hole 120B, andthe insertion hole 140 aB may be surrounded.

In addition, Embodiment 2 describes that the first partition wall 150Band the second partition wall 160B are provided. However, the inventionis not limited thereto. For example, when heat detection accuracy can bemaintained, any one of the first partition wall 150B or the secondpartition wall 160B may be omitted.

Modifications to Embodiment 3

Next, modifications of Embodiment 3 will be described.

(With Regard to Problem to be Solved and Effect of Invention)

First, a problem to be solved by the invention and effect of inventionare not limited to the above contents, and may differ in accordance withdetails of an implementation environment or a configuration of theinvention. Only some of the above-mentioned problems may be solved, oronly some of the above-mentioned effects may be achieved in some cases.

(With Regard to First Detection Target and Second Detection Target)

Embodiment 3 describes that the first detection target is smoke.However, the invention is not limited thereto. For example, the firstdetection target may be carbon monoxide. In this case, instead of thefirst light emitting unit, the second light emitting unit, and the lightreceiving unit, a carbon monoxide detection unit that detects carbonmonoxide is provided inside the housing. In addition, the firstdetection target may be smoke and carbon monoxide. In this case, insteadof the first light emitting unit, the second light emitting unit, andthe light receiving unit, the carbon monoxide detection unit is providedinside the housing.

In addition, Embodiment 3 describes that the second detection target isheat. However, the invention is not limited thereto. For example, thesecond detection target may be smoke or carbon monoxide. In this case,the first light emitting unit, the second light emitting unit, and thelight receiving unit, or the carbon monoxide detection unit is providedin the second detection space 62C.

(With Regard to Fire Detection Apparatus)

Embodiment 3 describes that the fire detection apparatus 1C includes theinner cover 30C. However, the invention is not limited thereto. Forexample, the inner cover 30C may be omitted. In this case, the firstcover portion 150C and the second cover portion 170C may be providedinside the outer cover 20C.

(With Regard to Heat Detection Unit)

Embodiment 3 describes that only a part of the heat detection unit 110Cis accommodated in the second detection space 62C. However, theinvention is not limited thereto. For example, the entire heat detectionunit 110C may be accommodated.

(With Regard to Second Detection Space)

Embodiment 3 describes that the second detection space 62C is providedoutside the housing. However, the invention is not limited thereto. Forexample, the second detection space 62C may be provided inside thehousing.

(With Regard to First Cover Portion and Second Cover Portion)

Embodiment 3 describes that the inner diameter on the proximal end sideof the heat detection unit 110C in the inner diameters of the secondcover portion 170C is set to be larger than the other inner diameter.However, the invention is not limited thereto. For example, the innerdiameters of the second cover portion 170C may be set to be uniform.

In addition, Embodiment 3 describes that the first cover portion 150C isconfigured to cover the entire outer periphery of each of the insertionhole 120C, the insertion hole 141C, and the first portion of the heatdetection unit 110C. However, the invention is not limited thereto, andthe first cover portion 150C may be configured to cover only a part ofthe outer periphery. In addition, Embodiment 3 describes that the secondcover portion 170C is configured to cover the entire outer periphery ofeach of the insertion hole 141C, the insertion hole 161C, and the secondportion of the heat detection unit 110C. However, the invention is notlimited thereto, and the second cover portion 170C may be configured tocover only a part of the outer periphery.

In addition, Embodiment 3 describes that the first cover portion 150Cand the insertion hole 120C are configured such that the end portion ofthe first cover portion 150C on the second detection space 62C side isfit to the top surface portion 22C through the insertion hole 120C.However, the invention is not limited thereto. For example, the firstcover portion 150C and the insertion hole 120C may be configured suchthat the end portion of the first cover portion 150C on the seconddetection space 62C side may not be fit to the top surface portion 22Cthrough the insertion hole 120C. In addition, Embodiment 3 describesthat the second cover portion 170C is configured to be able to be fit tothe first cover portion 150C. However, the invention is not limitedthereto. For example, fitting to the second cover portion 170C may notbe allowed.

One embodiment of the present invention provides a fire detectionapparatus comprises a housing; and a unit that detects the fire on aninside of the housing.

According to this embodiment, since a unit for detecting a fire isprovided inside the housing, a fire can be detected inside the housing,and the presence or absence of the occurrence of a fire can be detectedeffectively.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, the fire detection apparatus beingattached to an installation surface of an installation object, the firedetection apparatus comprising: a heat detection unit that detects thefire, a part of the heat detection unit being accommodated in the insideof the housing, the heat detection unit being configured such thatanother part of the heat detection unit is exposed to an outside of thefire detection apparatus through an insertion hole formed in an oppositeside portion corresponding to a side portion on an opposite side from aside portion on a side of the installation surface in side portions ofthe housing; and a guard unit provided to cover a periphery of theinsertion hole and another part of the heat detection unit in theopposite side portion, the guard unit having a plurality of ribs,wherein a material of some ribs among the plurality of ribs is madedifferent from a material of some other ribs, or a shape of some ribsamong the plurality of ribs is made different from a shape of some otherribs.

According to this embodiment, since the material of some ribs among theplurality of ribs is made different from the material of some otherribs, for example, it is possible to guide light irradiated from thedisplay unit accommodated in the housing to the outside of the firedetection apparatus through the some ribs and the insertion hole byforming only the some ribs using the translucent material. Therefore,since there is no need to provide the display hole for guiding lightirradiated from the display unit to the outside in the housing, it ispossible to maintain the design property of the fire detection apparatuswhen compared to a conventional technology (a technology in which theprotector and the display hole are exposed to the outside). In addition,since the shape of some ribs among the plurality of ribs is madedifferent from the shape of some other ribs, when compared to a case inwhich the plurality of ribs is formed in the same shape, it is easy touniformize the inflow of the air flow flowing into the housing from eachdirection in accordance with the installation state of the firedetection apparatus. Therefore, it is possible to improve the inflowproperty of the air flow in the fire detection apparatus.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein further comprising: a displayunit provided on the inside of the housing, the display unit displayingpredetermined information by irradiating light toward the outside of thefire detection apparatus through the insertion hole, wherein the someribs are formed using a translucent material, and the plurality of ribsis configured such that light irradiated from the display unit is guidedto the outside of the fire detection apparatus through the ribs formedusing the translucent material.

According to this embodiment, since the some ribs are formed using atranslucent material, and the plurality of ribs is configured such thatlight irradiated from the display unit is guided to the outside of thefire detection apparatus through the ribs formed using the translucentmaterial, the some of the ribs of the guard unit may be allowed tofunction as the light guide while ensuring the strength of the guardunit, and light irradiated from the display unit can be easily visuallyrecognized in various directions.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein thicknesses of the pluralityof ribs are set on the basis of an inflow or an inflow direction of anair flow flowing into the guard unit.

According to this embodiment, since thicknesses of the plurality of ribsare set on the basis of an inflow or an inflow direction of an air flowflowing into the guard unit, it is possible to set the thicknesses ofthe plurality of ribs based on the inflow or the inflow direction of theair flow flowing into the guard unit, and it is possible to ensure theinflow property of the air flow to the guard unit while maintaining thedurability of the guard unit.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the ribs formed using thetranslucent material are ribs thicker than a thinnest rib among theplurality of ribs.

According to this embodiment, since the ribs formed using thetranslucent material are ribs thicker than a thinnest rib among theplurality of ribs, light irradiated from the display unit is easilyguided to the outside of the fire detection apparatus while suppressingdamage to the ribs formed using the translucent material. Thus, it ispossible to further maintain the display function of the fire detectionapparatus while improving durability of the ribs formed using thetranslucent material.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the insertion hole isprovided in a portion other than a central portion in a portion of theopposite side portion.

According to this embodiment, since the insertion hole is provided in aportion other than a central portion in a portion of the opposite sideportion, when compared to the case in which the insertion hole is formedin the central portion of the opposite side portion, there are fewrestrictions on attachment of the heat detection unit and the displayunit. Therefore, it is possible to maintain an attachment property ofthe heat detection unit and the display unit.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein a rib on a side of thecentral portion of the opposite side portion among the plurality of ribsis a rib thinner than a thickest rib among the plurality of ribs or arib narrower than a widest rib.

According to this embodiment, since a rib on a side of the centralportion of the opposite side portion among the plurality of ribs is arib thinner than a thickest rib among the plurality of ribs or a ribnarrower than a widest rib, when the insertion hole is provided in aportion other than the central portion of the opposite side portion, itbecomes easier to uniformize the inflow of the air flow flowing in fromeach direction in the guard unit. Thus, it is possible to improve theinflow property of the air flow to the guard unit.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, further comprising: a first detectionspace for performing detection of a first detection target contained ina gas flowing in from an outside of the housing on the inside of thehousing; a second detection space located on the inside or the outsideof the housing, the second detection space being provided to performdetection of a second detection target; and a partition wall provided inthe housing, the partition wall being provided to partition the firstdetection space or the second detection space so that inhibiting the gasflowing into the first detection space from flowing out to the seconddetection space is allowed.

According to this embodiment, since a first detection space forperforming detection of a first detection target contained in a gasflowing in from an outside of the housing on the inside of the housing,a second detection space located on the outside of the housing, thesecond detection space being provided to perform detection of a seconddetection target, and a partition wall provided in the housing, thepartition wall being provided to partition the first detection space orthe second detection space so that inhibiting the gas flowing into thefirst detection space from flowing out to the second detection space isallowed are included, it is possible to inhibit gas flowing into thefirst detection space from flowing out to the second detection space.Therefore, when compared to a case in which the partition wall is notprovided, it is possible to prevent detection of the second detectiontarget by the detection unit from being inhibited by the gas that hasflowed in, and it is possible to maintain or improve detection accuracyof the second detection target.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the first detection spaceincludes a first detection space body in which detection of the firstdetection target is performed, and an inflow space for allowing the gascontaining the first detection target to flow into the first detectionspace body, the fire detection apparatus further comprises an insertionhole provided in a portion facing the inflow space in a portion of thehousing to insert a part of a second detection target detecting unitthat detects the second detection target accommodated in the housing,into the second detection space, and the partition wall is configured tosurround at least a part of a periphery of the second detection targetdetecting unit and the insert hole in the inflow space.

According to this embodiment, since an insertion hole provided in aportion facing the inflow space in a portion of the housing to insert apart of a second detection target detecting unit into the seconddetection space is included, and the partition wall is configured tosurround at least a part of a periphery of the second detection targetdetecting unit and the insert hole in the inflow space, it is possibleto effectively inhibit gas flowing into the inflow space from flowingout to the second detection space through the insertion hole, anddetection accuracy of the second detection target is easily maintained.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, further comprising: an inflow holeprovided in the housing to allow the gas containing the first detectiontarget to flow into the first detection space; and a first detectiontarget detecting unit that detects the first detection target, the firstdetection target detecting unit being accommodated in the firstdetection space, wherein the partition wall is configured to surround atleast a part of a periphery of the first detection target detecting unitand the inflow hole in the first detection space.

According to this embodiment, since an inflow hole provided in thehousing and a first detection target detecting unit that detects thefirst detection target are included, and the partition wall isconfigured to surround at least a part of a periphery of the firstdetection target detecting unit and the inflow hole in the firstdetection space, it is possible to effectively inhibit gas flowing intothe first detection space from flowing out to the second detection spacethrough the inflow hole, and detection accuracy of the second detectiontarget is easily maintained.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the housing and the partitionwall are mutually integrally formed.

According to this embodiment, since the housing and the partition wallare mutually integrally formed, when compared to a case in which thehousing is separately formed from the partition wall, it is possible tosave time and effort to attach the partition wall to the housing, and toimprove manufacturability of the fire detection apparatus. In addition,it is possible to reduce the number of parts of the fire detectionapparatus, and to reduce an environmental load accompanying manufactureof the fire detection apparatus.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the first detection target issmoke or carbon monoxide, and the second detection target is heat.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, further comprising: a first detectionspace located on the inside of the housing to perform detection of afirst detection target; a second detection space located on the insideor an outside of the housing to perform detection of a second detectiontarget; an inflow space located on the inside of the housing to allowgas containing the first detection target to flow into the firstdetection space from the outside of the housing; a detection unit thatdetects the second detection target, the detection unit being providedsuch that at least a part of the detection unit is accommodated in thesecond detection space; and a cover unit that covers at least a part ofa periphery of the detection unit such that inhibiting the gas flowinginto the inflow space from coming into contact with the detection unitis allowed.

According to this embodiment, since a first detection space located onthe inside of the housing, a second detection space located on theinside or an outside of the housing, an inflow space located on theinside of the housing to allow gas containing the first detection targetto flow into the first detection space from the outside of the housing,a detection unit that detects the second detection target, the detectionunit being provided such that at least a part of the detection unit isaccommodated in the second detection space, and a cover unit that coversat least a part of a periphery of the detection unit such thatinhibiting the gas flowing into the inflow space from coming intocontact with the detection unit is allowed are included, it is possibleto inhibit gas flowing into the inflow space from coming into contactwith the detection unit, and it is possible to maintain or improvedetection accuracy of the second detection target.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the cover unit is formed froma tubular body into which the detection unit is allowed to be inserted.

According to this embodiment, since the cover unit is formed from atubular body into which the detection unit is allowed to be inserted, itis possible to simply configure the cover unit, and it is possible toimprove manufacturability of the cover unit.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein an inner diameter on aproximal end side of the detection unit in inner diameters of the coverunit is set to be larger than the other inner diameter.

According to this embodiment, since an inner diameter on a proximal endside of the detection unit in inner diameters of the cover unit is setto be larger than the other inner diameter, it is possible to increaseinsertability of the detection unit into the cover unit, and a sizereduction of the cover unit is facilitated.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein an inner diameter of at leasta part of the cover unit is set to be substantially the same as an outerdiameter of a portion of the detection unit inserted into the coverunit.

According to this embodiment, since an inner diameter of at least a partof the cover unit is set to be substantially the same as an outerdiameter of a portion of the detection unit inserted into the coverunit, it becomes easy to inhibit gas flowing into the inflow space fromcoming into contact with the detection unit, and it becomes easy tomaintain detection accuracy of the second detection target.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein an insertion hole forinserting the detection unit into the second detection space is providedin a facing side portion facing the second detection space in a sideportion of the housing, and the insertion hole and the cover unit areconfigured to allow an end portion of the cover unit on a side of thesecond detection space to be fit to the facing side portion through theinsertion hole.

According to this embodiment, since an insertion hole for inserting thedetection unit into the second detection space is provided in a facingside portion facing the second detection space in a side portion of thehousing, and the insertion hole and the cover unit are configured toallow an end portion of the cover unit on a side of the second detectionspace to be fit to the facing side portion through the insertion hole,it is possible to inhibit gas flowing into the inflow space from flowingin from the end portion on the second detection space side, and itbecomes more easy to inhibit gas flowing into the inflow space fromcoming into contact with the detection unit. In addition, at the time ofassembly of the fire detection apparatus, positioning of the cover unitis facilitated, and thus it is possible to rapidly and accuratelyperform assembly work.

Another embodiment of the present invention provides the alarm apparatusaccording to the above embodiment, wherein the first detection target issmoke or carbon monoxide, and the second detection target is heat.

According to this embodiment, since the first detection target is smokeor carbon monoxide, and the second detection target is heat, contact ofgas containing smoke with the sensing unit can be suppressed, and heatdetection accuracy can be maintained or improved.

REFERENCE SIGNS LIST

-   -   1A Fire detection apparatus    -   2A Installation surface    -   10A Attachment base    -   20A Outer cover    -   21A Outer cover body    -   22A Top surface portion    -   23A First rib portion    -   24A Second rib portion    -   30A Inner cover    -   30 aA First opening    -   40A Inflow space    -   50A Insect screen    -   60A Detection space    -   70A Detector cover    -   70 aA Second opening    -   80A Detector body    -   81A Base    -   90A Terminal board    -   91A Attachment member    -   100A Substrate    -   104 aA Light guide    -   110A Heat detection unit    -   120A Insertion hole    -   130A Guard portion    -   131A First guard side rib    -   132A second guard side rib    -   133A Third guard side rib    -   134A Fourth guard side rib    -   135A Guard side connecting portion    -   DA Predetermined distance    -   H1A Height of ceiling portion    -   H2A Height of eyes of person    -   HMA Person    -   1B Fire detection apparatus    -   2B Installation surface    -   10B Attachment base    -   20B Outer cover    -   21B Outer cover body    -   22B Top surface portion    -   23B First rib portion    -   24B Second rib portion    -   30B Inner cover    -   30 aB First opening    -   30 bB Inflow hole    -   40B Inflow space    -   50B Insect screen    -   61B Carbon monoxide detection space    -   62B Heat detection space    -   63B Smoke detection space    -   70B Detector cover    -   70 aB Second opening    -   80B Detector body    -   90B Terminal board    -   91B Attachment member    -   91 aB First attachment hole    -   91 bB Second attachment hole    -   100B Substrate    -   110B Heat detection unit    -   120B Insertion hole    -   130B Guard portion    -   131B Guard side rib    -   140 aB Insertion hole    -   140 bB Insertion hole    -   150B First partition wall    -   160B Second partition wall    -   1C Fire detection apparatus    -   2C Installation surface    -   10C Attachment base    -   20C Outer cover    -   21C Outer cover body    -   22C Top surface portion    -   23C First rib portion    -   24C Second rib portion    -   30C Inner cover    -   30 aC First opening    -   40C Inflow space    -   50C Insect screen    -   61C First detection space    -   62C Second detection space    -   70C Detector cover    -   70 aC Second opening    -   80C Detector body    -   90C Terminal board    -   91C Attachment member    -   91 aC First attachment hole    -   91 bC Second attachment hole    -   100C Substrate    -   110C Heat detection unit    -   120C Insertion hole    -   130C Guard portion    -   131C Guard side rib    -   141C Insertion hole    -   142C Insertion hole    -   150C First cover portion    -   161C Insertion hole    -   162C Insertion hole    -   170C Second cover portion

1. A fire detection apparatus for detecting a fire in a monitored area,the fire detection apparatus comprising: a housing; and a unit thatdetects the fire on an inside of the housing.
 2. The fire detectionapparatus according to claim 1, the fire detection apparatus beingattached to an installation surface of an installation object, the firedetection apparatus comprising: a heat detection unit that detects thefire, a part of the heat detection unit being accommodated in the insideof the housing, the heat detection unit being configured such thatanother part of the heat detection unit is exposed to an outside of thefire detection apparatus through an insertion hole formed in an oppositeside portion corresponding to a side portion on an opposite side from aside portion on a side of the installation surface in side portions ofthe housing; and a guard unit provided to cover a periphery of theinsertion hole and another part of the heat detection unit in theopposite side portion, the guard unit having a plurality of ribs,wherein a material of some ribs among the plurality of ribs is madedifferent from a material of some other ribs, or a shape of some ribsamong the plurality of ribs is made different from a shape of some otherribs.
 3. The fire detection apparatus according to claim 2, furthercomprising: a display unit provided on the inside of the housing, thedisplay unit displaying predetermined information by irradiating lighttoward the outside of the fire detection apparatus through the insertionhole, wherein the some ribs are formed using a translucent material, andthe plurality of ribs is configured such that light irradiated from thedisplay unit is guided to the outside of the fire detection apparatusthrough the ribs formed using the translucent material.
 4. The firedetection apparatus according to claim 2, wherein thicknesses of theplurality of ribs are set on the basis of an inflow or an inflowdirection of an air flow flowing into the guard unit.
 5. The firedetection apparatus according to claim 2, wherein the ribs formed usingthe translucent material are ribs thicker than a thinnest rib among theplurality of ribs.
 6. The fire detection apparatus according to claim 2,wherein the insertion hole is provided in a portion other than a centralportion in a portion of the opposite side portion.
 7. The fire detectionapparatus according to claim 6, wherein a rib on a side of the centralportion of the opposite side portion among the plurality of ribs is arib thinner than a thickest rib among the plurality of ribs or a ribnarrower than a widest rib.
 8. The fire detection apparatus according toclaim 1, further comprising: a first detection space for performingdetection of a first detection target contained in a gas flowing in froman outside of the housing on the inside of the housing; a seconddetection space located on the inside or the outside of the housing, thesecond detection space being provided to perform detection of a seconddetection target; and a partition wall provided in the housing, thepartition wall being provided to partition the first detection space orthe second detection space so that inhibiting the gas flowing into thefirst detection space from flowing out to the second detection space isallowed.
 9. The fire detection apparatus according to claim 8, whereinthe first detection space includes a first detection space body in whichdetection of the first detection target is performed, and an inflowspace for allowing the gas containing the first detection target to flowinto the first detection space body, the fire detection apparatusfurther comprises an insertion hole provided in a portion facing theinflow space in a portion of the housing to insert a part of a seconddetection target detecting unit that detects the second detection targetaccommodated in the housing, into the second detection space, and thepartition wall is configured to surround at least a part of a peripheryof the second detection target detecting unit and the insert hole in theinflow space.
 10. The fire detection apparatus according to claim 8,further comprising: an inflow hole provided in the housing to allow thegas containing the first detection target to flow into the firstdetection space; and a first detection target detecting unit thatdetects the first detection target, the first detection target detectingunit being accommodated in the first detection space, wherein thepartition wall is configured to surround at least a part of a peripheryof the first detection target detecting unit and the inflow hole in thefirst detection space.
 11. The fire detection apparatus according toclaim 8, wherein the housing and the partition wall are mutuallyintegrally formed.
 12. The fire detection apparatus according to claim8, wherein the first detection target is smoke or carbon monoxide, andthe second detection target is heat.
 13. The fire detection apparatusaccording to claim 1, further comprising: a first detection spacelocated on the inside of the housing to perform detection of a firstdetection target; a second detection space located on the inside or anoutside of the housing to perform detection of a second detectiontarget; an inflow space located on the inside of the housing to allowgas containing the first detection target to flow into the firstdetection space from the outside of the housing; a detection unit thatdetects the second detection target, the detection unit being providedsuch that at least a part of the detection unit is accommodated in thesecond detection space; and a cover unit that covers at least a part ofa periphery of the detection unit such that inhibiting the gas flowinginto the inflow space from coming into contact with the detection unitis allowed.
 14. The fire detection apparatus according to claim 13,wherein the cover unit is formed from a tubular body into which thedetection unit is allowed to be inserted.
 15. The fire detectionapparatus according to claim 14, wherein an inner diameter on a proximalend side of the detection unit in inner diameters of the cover unit isset to be larger than the other inner diameter.
 16. The fire detectionapparatus according to claim 14, wherein an inner diameter of at least apart of the cover unit is set to be substantially the same as an outerdiameter of a portion of the detection unit inserted into the coverunit.
 17. The fire detection apparatus according to claim 14, wherein aninsertion hole for inserting the detection unit into the seconddetection space is provided in a facing side portion facing the seconddetection space in a side portion of the housing, and the insertion holeand the cover unit are configured to allow an end portion of the coverunit on a side of the second detection space to be fit to the facingside portion through the insertion hole.
 18. The fire detectionapparatus according to claim 13, wherein the first detection target issmoke or carbon monoxide, and the second detection target is heat.